Policies.jsm 26.5 KB
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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

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ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm");
ChromeUtils.import("resource://gre/modules/Services.jsm");
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XPCOMUtils.defineLazyServiceGetter(this, "gXulStore",
                                   "@mozilla.org/xul/xulstore;1",
                                   "nsIXULStore");
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XPCOMUtils.defineLazyModuleGetters(this, {
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  AddonManager: "resource://gre/modules/AddonManager.jsm",
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  BookmarksPolicies: "resource:///modules/policies/BookmarksPolicies.jsm",
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  CustomizableUI: "resource:///modules/CustomizableUI.jsm",
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  ProxyPolicies: "resource:///modules/policies/ProxyPolicies.jsm",
  WebsiteFilter: "resource:///modules/policies/WebsiteFilter.jsm",
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});

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const PREF_LOGLEVEL           = "browser.policies.loglevel";
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const BROWSER_DOCUMENT_URL    = "chrome://browser/content/browser.xul";
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XPCOMUtils.defineLazyGetter(this, "log", () => {
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  let { ConsoleAPI } = ChromeUtils.import("resource://gre/modules/Console.jsm", {});
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  return new ConsoleAPI({
    prefix: "Policies.jsm",
    // tip: set maxLogLevel to "debug" and use log.debug() to create detailed
    // messages during development. See LOG_LEVELS in Console.jsm for details.
    maxLogLevel: "error",
    maxLogLevelPref: PREF_LOGLEVEL,
  });
});

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var EXPORTED_SYMBOLS = ["Policies"];
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/*
 * ============================
 * = POLICIES IMPLEMENTATIONS =
 * ============================
 *
 * The Policies object below is where the implementation for each policy
 * happens. An object for each policy should be defined, containing
 * callback functions that will be called by the engine.
 *
 * See the _callbacks object in EnterprisePolicies.js for the list of
 * possible callbacks and an explanation of each.
 *
 * Each callback will be called with two parameters:
 * - manager
 *   This is the EnterprisePoliciesManager singleton object from
 *   EnterprisePolicies.js
 *
 * - param
 *   The parameter defined for this policy in policies-schema.json.
 *   It will be different for each policy. It could be a boolean,
 *   a string, an array or a complex object. All parameters have
 *   been validated according to the schema, and no unknown
 *   properties will be present on them.
 *
 * The callbacks will be bound to their parent policy object.
 */
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var Policies = {
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  "Authentication": {
    onBeforeAddons(manager, param) {
      if ("SPNEGO" in param) {
        setAndLockPref("network.negotiate-auth.trusted-uris", param.SPNEGO.join(", "));
      }
      if ("Delegated" in param) {
        setAndLockPref("network.negotiate-auth.delegation-uris", param.Delegated.join(", "));
      }
      if ("NTLM" in param) {
        setAndLockPref("network.automatic-ntlm-auth.trusted-uris", param.NTLM.join(", "));
      }
    }
  },

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  "BlockAboutAddons": {
    onBeforeUIStartup(manager, param) {
      if (param) {
        manager.disallowFeature("about:addons", true);
      }
    }
  },

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  "BlockAboutConfig": {
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    onBeforeUIStartup(manager, param) {
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      if (param) {
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        manager.disallowFeature("about:config", true);
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        setAndLockPref("devtools.chrome.enabled", false);
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      }
    }
  },
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  "BlockAboutProfiles": {
    onBeforeUIStartup(manager, param) {
      if (param) {
        manager.disallowFeature("about:profiles", true);
      }
    }
  },

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  "BlockAboutSupport": {
    onBeforeUIStartup(manager, param) {
      if (param) {
        manager.disallowFeature("about:support", true);
      }
    }
  },

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  "Bookmarks": {
    onAllWindowsRestored(manager, param) {
      BookmarksPolicies.processBookmarks(param);
    }
  },

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  "Certificates": {
    onBeforeAddons(manager, param) {
      if ("ImportEnterpriseRoots" in param) {
        setAndLockPref("security.enterprise_roots.enabled", true);
      }
    }
  },

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  "Cookies": {
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    onBeforeUIStartup(manager, param) {
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      addAllowDenyPermissions("cookie", param.Allow, param.Block);
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      if (param.Block) {
        const hosts = param.Block.map(uri => uri.host).sort().join("\n");
        runOncePerModification("clearCookiesForBlockedHosts", hosts, () => {
          for (let blocked of param.Block) {
            Services.cookies.removeCookiesWithOriginAttributes("{}", blocked.host);
          }
        });
      }
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      if (param.Default !== undefined ||
          param.AcceptThirdParty !== undefined ||
          param.Locked) {
        const ACCEPT_COOKIES = 0;
        const REJECT_THIRD_PARTY_COOKIES = 1;
        const REJECT_ALL_COOKIES = 2;
        const REJECT_UNVISITED_THIRD_PARTY = 3;

        let newCookieBehavior = ACCEPT_COOKIES;
        if (param.Default !== undefined && !param.Default) {
          newCookieBehavior = REJECT_ALL_COOKIES;
        } else if (param.AcceptThirdParty) {
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          if (param.AcceptThirdParty == "never") {
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            newCookieBehavior = REJECT_THIRD_PARTY_COOKIES;
          } else if (param.AcceptThirdParty == "from-visited") {
            newCookieBehavior = REJECT_UNVISITED_THIRD_PARTY;
          }
        }

        if (param.Locked) {
          setAndLockPref("network.cookie.cookieBehavior", newCookieBehavior);
        } else {
          setDefaultPref("network.cookie.cookieBehavior", newCookieBehavior);
        }
      }

      const KEEP_COOKIES_UNTIL_EXPIRATION = 0;
      const KEEP_COOKIES_UNTIL_END_OF_SESSION = 2;

      if (param.ExpireAtSessionEnd !== undefined || param.Locked) {
        let newLifetimePolicy = KEEP_COOKIES_UNTIL_EXPIRATION;
        if (param.ExpireAtSessionEnd) {
          newLifetimePolicy = KEEP_COOKIES_UNTIL_END_OF_SESSION;
        }

        if (param.Locked) {
          setAndLockPref("network.cookie.lifetimePolicy", newLifetimePolicy);
        } else {
          setDefaultPref("network.cookie.lifetimePolicy", newLifetimePolicy);
        }
      }
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    }
  },

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  "DisableAppUpdate": {
    onBeforeAddons(manager, param) {
      if (param) {
        manager.disallowFeature("appUpdate");
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      }
    }
  },

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  "DisableBuiltinPDFViewer": {
    onBeforeUIStartup(manager, param) {
      if (param) {
        manager.disallowFeature("PDF.js");
      }
    }
  },

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  "DisableDeveloperTools": {
    onBeforeAddons(manager, param) {
      if (param) {
        setAndLockPref("devtools.policy.disabled", true);
        setAndLockPref("devtools.chrome.enabled", false);

        manager.disallowFeature("devtools");
        manager.disallowFeature("about:devtools");
        manager.disallowFeature("about:debugging");
        manager.disallowFeature("about:devtools-toolbox");
      }
    }
  },

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  "DisableFeedbackCommands": {
    onBeforeUIStartup(manager, param) {
      if (param) {
        manager.disallowFeature("feedbackCommands");
      }
    }
  },

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  "DisableFirefoxAccounts": {
    onBeforeAddons(manager, param) {
      if (param) {
        setAndLockPref("identity.fxaccounts.enabled", false);
      }
    }
  },

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  "DisableFirefoxScreenshots": {
    onBeforeAddons(manager, param) {
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      if (param) {
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        setAndLockPref("extensions.screenshots.disabled", true);
      }
    }
  },

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  "DisableFirefoxStudies": {
    onBeforeAddons(manager, param) {
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      if (param) {
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        manager.disallowFeature("Shield");
      }
    }
  },

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  "DisableForgetButton": {
    onProfileAfterChange(manager, param) {
      if (param) {
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        setAndLockPref("privacy.panicButton.enabled", false);
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      }
    }
  },

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  "DisableFormHistory": {
    onBeforeUIStartup(manager, param) {
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      if (param) {
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        setAndLockPref("browser.formfill.enable", false);
      }
    }
  },

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  "DisableMasterPasswordCreation": {
    onBeforeUIStartup(manager, param) {
      if (param) {
        manager.disallowFeature("createMasterPassword");
      }
    }
  },

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  "DisablePocket": {
    onBeforeAddons(manager, param) {
      if (param) {
        setAndLockPref("extensions.pocket.enabled", false);
      }
    }
  },

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  "DisablePrivateBrowsing": {
    onBeforeAddons(manager, param) {
      if (param) {
        manager.disallowFeature("privatebrowsing");
        manager.disallowFeature("about:privatebrowsing", true);
        setAndLockPref("browser.privatebrowsing.autostart", false);
      }
    }
  },

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  "DisableProfileImport": {
    onBeforeUIStartup(manager, param) {
      if (param) {
        manager.disallowFeature("profileImport");
        setAndLockPref("browser.newtabpage.activity-stream.migrationExpired", true);
      }
    }
  },

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  "DisableProfileRefresh": {
    onBeforeUIStartup(manager, param) {
      if (param) {
        manager.disallowFeature("profileRefresh");
        setAndLockPref("browser.disableResetPrompt", true);
      }
    }
  },

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  "DisableSafeMode": {
    onBeforeUIStartup(manager, param) {
      if (param) {
        manager.disallowFeature("safeMode");
      }
    }
  },

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  "DisableSecurityBypass": {
    onBeforeUIStartup(manager, param) {
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      if ("InvalidCertificate" in param) {
        setAndLockPref("security.certerror.hideAddException", param.InvalidCertificate);
      }

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      if ("SafeBrowsing" in param) {
        setAndLockPref("browser.safebrowsing.allowOverride", !param.SafeBrowsing);
      }
    }
  },

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  "DisableSetDesktopBackground": {
    onBeforeUIStartup(manager, param) {
      if (param) {
        manager.disallowFeature("setDesktopBackground", true);
      }
    }
  },

  "DisableSystemAddonUpdate": {
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    onBeforeAddons(manager, param) {
      if (param) {
        manager.disallowFeature("SysAddonUpdate");
      }
    }
  },

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  "DisableTelemetry": {
    onBeforeAddons(manager, param) {
      if (param) {
        setAndLockPref("datareporting.healthreport.uploadEnabled", false);
        setAndLockPref("datareporting.policy.dataSubmissionEnabled", false);
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        manager.disallowFeature("about:telemetry");
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      }
    }
  },

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  "DisplayBookmarksToolbar": {
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    onBeforeUIStartup(manager, param) {
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      let value = (!param).toString();
      // This policy is meant to change the default behavior, not to force it.
      // If this policy was alreay applied and the user chose to re-hide the
      // bookmarks toolbar, do not show it again.
      runOncePerModification("displayBookmarksToolbar", value, () => {
        gXulStore.setValue(BROWSER_DOCUMENT_URL, "PersonalToolbar", "collapsed", value);
      });
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    }
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  },

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  "DisplayMenuBar": {
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    onBeforeUIStartup(manager, param) {
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      let value = (!param).toString();
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        // This policy is meant to change the default behavior, not to force it.
        // If this policy was alreay applied and the user chose to re-hide the
        // menu bar, do not show it again.
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      runOncePerModification("displayMenuBar", value, () => {
        gXulStore.setValue(BROWSER_DOCUMENT_URL, "toolbar-menubar", "autohide", value);
      });
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    }
  },

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  "DontCheckDefaultBrowser": {
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    onBeforeUIStartup(manager, param) {
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      setAndLockPref("browser.shell.checkDefaultBrowser", false);
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    }
  },

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  "EnableTrackingProtection": {
    onBeforeUIStartup(manager, param) {
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      if (param.Value) {
        if (param.Locked) {
          setAndLockPref("privacy.trackingprotection.enabled", true);
          setAndLockPref("privacy.trackingprotection.pbmode.enabled", true);
        } else {
          setDefaultPref("privacy.trackingprotection.enabled", true);
          setDefaultPref("privacy.trackingprotection.pbmode.enabled", true);
        }
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      } else {
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        setAndLockPref("privacy.trackingprotection.enabled", false);
        setAndLockPref("privacy.trackingprotection.pbmode.enabled", false);
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      }
    }
  },

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  "Extensions": {
    onBeforeUIStartup(manager, param) {
      if ("Install" in param) {
        runOncePerModification("extensionsInstall", JSON.stringify(param.Install), () => {
          for (let location of param.Install) {
            let url;
            if (location.includes("://")) {
              // Assume location is an URI
              url = location;
            } else {
              // Assume location is a file path
              let xpiFile = Cc["@mozilla.org/file/local;1"].createInstance(Ci.nsIFile);
              try {
                xpiFile.initWithPath(location);
              } catch (e) {
                log.error(`Invalid extension path location - ${location}`);
                continue;
              }
              url = Services.io.newFileURI(xpiFile).spec;
            }
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            AddonManager.getInstallForURL(url, "application/x-xpinstall").then(install => {
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              if (install.addon && install.addon.appDisabled) {
                log.error(`Incompatible add-on - ${location}`);
                install.cancel();
                return;
              }
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              let listener = {
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              /* eslint-disable-next-line no-shadow */
                onDownloadEnded: (install) => {
                  if (install.addon && install.addon.appDisabled) {
                    log.error(`Incompatible add-on - ${location}`);
                    install.removeListener(listener);
                    install.cancel();
                  }
                },
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                onDownloadFailed: () => {
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                  install.removeListener(listener);
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                  log.error(`Download failed - ${location}`);
                },
                onInstallFailed: () => {
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                  install.removeListener(listener);
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                  log.error(`Installation failed - ${location}`);
                },
                onInstallEnded: () => {
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                  install.removeListener(listener);
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                  log.debug(`Installation succeeded - ${location}`);
                }
              };
              install.addListener(listener);
              install.install();
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            });
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          }
        });
      }
      if ("Uninstall" in param) {
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        runOncePerModification("extensionsUninstall", JSON.stringify(param.Uninstall), async () => {
          let addons = await AddonManager.getAddonsByIDs(param.Uninstall);
          for (let addon of addons) {
            if (addon) {
              try {
                addon.uninstall();
              } catch (e) {
                // This can fail for add-ons that can't be uninstalled.
                // Just ignore.
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              }
            }
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          }
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        });
      }
      if ("Locked" in param) {
        for (let ID of param.Locked) {
          manager.disallowFeature(`modify-extension:${ID}`);
        }
      }
    }
  },

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  "FlashPlugin": {
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    onBeforeUIStartup(manager, param) {
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      addAllowDenyPermissions("plugin:flash", param.Allow, param.Block);
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      const FLASH_NEVER_ACTIVATE = 0;
      const FLASH_ASK_TO_ACTIVATE = 1;
      const FLASH_ALWAYS_ACTIVATE = 2;

      let flashPrefVal;
      if (param.Default === undefined) {
        flashPrefVal = FLASH_ASK_TO_ACTIVATE;
      } else if (param.Default) {
        flashPrefVal = FLASH_ALWAYS_ACTIVATE;
      } else {
        flashPrefVal = FLASH_NEVER_ACTIVATE;
      }
      if (param.Locked) {
        setAndLockPref("plugin.state.flash", flashPrefVal);
      } else if (param.Default !== undefined) {
        setDefaultPref("plugin.state.flash", flashPrefVal);
      }
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    }
  },

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  "Homepage": {
    onBeforeUIStartup(manager, param) {
      // |homepages| will be a string containing a pipe-separated ('|') list of
      // URLs because that is what the "Home page" section of about:preferences
      // (and therefore what the pref |browser.startup.homepage|) accepts.
      let homepages = param.URL.spec;
      if (param.Additional && param.Additional.length > 0) {
        homepages += "|" + param.Additional.map(url => url.spec).join("|");
      }
      if (param.Locked) {
        setAndLockPref("browser.startup.homepage", homepages);
        setAndLockPref("browser.startup.page", 1);
        setAndLockPref("pref.browser.homepage.disable_button.current_page", true);
        setAndLockPref("pref.browser.homepage.disable_button.bookmark_page", true);
        setAndLockPref("pref.browser.homepage.disable_button.restore_default", true);
      } else {
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        // The default pref for homepage is actually a complex pref. We need to
        // set it in a special way such that it works properly
        let homepagePrefVal = "data:text/plain,browser.startup.homepage=" +
                               homepages;
        setDefaultPref("browser.startup.homepage", homepagePrefVal);
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        setDefaultPref("browser.startup.page", 1);
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        runOncePerModification("setHomepage", homepages, () => {
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          Services.prefs.clearUserPref("browser.startup.homepage");
          Services.prefs.clearUserPref("browser.startup.page");
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        });
      }
    }
  },

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  "InstallAddonsPermission": {
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    onBeforeUIStartup(manager, param) {
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      if ("Allow" in param) {
        addAllowDenyPermissions("install", param.Allow, null);
      }
      if ("Default" in param) {
        setAndLockPref("xpinstall.enabled", param.Default);
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        if (!param.Default) {
          manager.disallowFeature("about:debugging");
        }
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      }
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    }
  },

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  "NoDefaultBookmarks": {
    onProfileAfterChange(manager, param) {
      if (param) {
        manager.disallowFeature("defaultBookmarks");
      }
    }
  },

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  "OfferToSaveLogins": {
    onBeforeUIStartup(manager, param) {
      setAndLockPref("signon.rememberSignons", param);
    }
  },

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  "OverrideFirstRunPage": {
    onProfileAfterChange(manager, param) {
      let url = param ? param.spec : "";
      setAndLockPref("startup.homepage_welcome_url", url);
    }
  },

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  "OverridePostUpdatePage": {
    onProfileAfterChange(manager, param) {
      let url = param ? param.spec : "";
      setAndLockPref("startup.homepage_override_url", url);
      // The pref startup.homepage_override_url is only used
      // as a fallback when the update.xml file hasn't provided
      // a specific post-update URL.
      manager.disallowFeature("postUpdateCustomPage");
    }
  },

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  "PopupBlocking": {
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    onBeforeUIStartup(manager, param) {
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      addAllowDenyPermissions("popup", param.Allow, null);
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      if (param.Locked) {
        let blockValue = true;
        if (param.Default !== undefined && !param.Default) {
          blockValue = false;
        }
        setAndLockPref("dom.disable_open_during_load", blockValue);
      } else if (param.Default !== undefined) {
        setDefaultPref("dom.disable_open_during_load", !!param.Default);
      }
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    }
  },

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  "Proxy": {
    onBeforeAddons(manager, param) {
      if (param.Locked) {
        manager.disallowFeature("changeProxySettings");
        ProxyPolicies.configureProxySettings(param, setAndLockPref);
      } else {
        ProxyPolicies.configureProxySettings(param, setDefaultPref);
      }
    }
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  },
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  "SanitizeOnShutdown": {
    onBeforeUIStartup(manager, param) {
      setAndLockPref("privacy.sanitize.sanitizeOnShutdown", param);
      if (param) {
        setAndLockPref("privacy.clearOnShutdown.cache", true);
        setAndLockPref("privacy.clearOnShutdown.cookies", true);
        setAndLockPref("privacy.clearOnShutdown.downloads", true);
        setAndLockPref("privacy.clearOnShutdown.formdata", true);
        setAndLockPref("privacy.clearOnShutdown.history", true);
        setAndLockPref("privacy.clearOnShutdown.sessions", true);
        setAndLockPref("privacy.clearOnShutdown.siteSettings", true);
        setAndLockPref("privacy.clearOnShutdown.offlineApps", true);
      }
    }
  },

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  "SearchBar": {
    onAllWindowsRestored(manager, param) {
      // This policy is meant to change the default behavior, not to force it.
      // If this policy was already applied and the user chose move the search
      // bar, don't move it again.
      runOncePerModification("searchInNavBar", param, () => {
        if (param == "separate") {
          CustomizableUI.addWidgetToArea("search-container", CustomizableUI.AREA_NAVBAR,
          CustomizableUI.getPlacementOfWidget("urlbar-container").position + 1);
        } else if (param == "unified") {
          CustomizableUI.removeWidgetFromArea("search-container");
        }
      });
    }
  },

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  "SearchEngines": {
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    onBeforeUIStartup(manager, param) {
      if (param.PreventInstalls) {
        manager.disallowFeature("installSearchEngine", true);
      }
    },
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    onAllWindowsRestored(manager, param) {
      Services.search.init(() => {
        if (param.Add) {
          // Only rerun if the list of engine names has changed.
          let engineNameList = param.Add.map(engine => engine.Name);
          runOncePerModification("addSearchEngines",
                                 JSON.stringify(engineNameList),
                                 () => {
            for (let newEngine of param.Add) {
              let newEngineParameters = {
                template:    newEngine.URLTemplate,
                iconURL:     newEngine.IconURL,
                alias:       newEngine.Alias,
                description: newEngine.Description,
                method:      newEngine.Method,
                suggestURL:  newEngine.SuggestURLTemplate,
                extensionID: "set-via-policy"
              };
              try {
                Services.search.addEngineWithDetails(newEngine.Name,
                                                     newEngineParameters);
              } catch (ex) {
                log.error("Unable to add search engine", ex);
              }
            }
          });
        }
        if (param.Default) {
          runOnce("setDefaultSearchEngine", () => {
            let defaultEngine;
            try {
              defaultEngine = Services.search.getEngineByName(param.Default);
              if (!defaultEngine) {
                throw "No engine by that name could be found";
              }
            } catch (ex) {
              log.error(`Search engine lookup failed when attempting to set ` +
                        `the default engine. Requested engine was ` +
                        `"${param.Default}".`, ex);
            }
            if (defaultEngine) {
              try {
                Services.search.currentEngine = defaultEngine;
              } catch (ex) {
                log.error("Unable to set the default search engine", ex);
              }
            }
          });
        }
      });
    }
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  },

  "WebsiteFilter": {
    onBeforeUIStartup(manager, param) {
      this.filter = new WebsiteFilter(param.Block || [], param.Exceptions || []);
    }
  },

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};
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/*
 * ====================
 * = HELPER FUNCTIONS =
 * ====================
 *
 * The functions below are helpers to be used by several policies.
 */

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/**
 * setAndLockPref
 *
 * Sets the _default_ value of a pref, and locks it (meaning that
 * the default value will always be returned, independent from what
 * is stored as the user value).
 * The value is only changed in memory, and not stored to disk.
 *
 * @param {string} prefName
 *        The pref to be changed
 * @param {boolean,number,string} prefValue
 *        The value to set and lock
 */
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function setAndLockPref(prefName, prefValue) {
  if (Services.prefs.prefIsLocked(prefName)) {
    Services.prefs.unlockPref(prefName);
  }

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  setDefaultPref(prefName, prefValue);

  Services.prefs.lockPref(prefName);
}

/**
 * setDefaultPref
 *
 * Sets the _default_ value of a pref.
 * The value is only changed in memory, and not stored to disk.
 *
 * @param {string} prefName
 *        The pref to be changed
 * @param {boolean,number,string} prefValue
 *        The value to set
 */
function setDefaultPref(prefName, prefValue) {
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  let defaults = Services.prefs.getDefaultBranch("");

  switch (typeof(prefValue)) {
    case "boolean":
      defaults.setBoolPref(prefName, prefValue);
      break;

    case "number":
      if (!Number.isInteger(prefValue)) {
        throw new Error(`Non-integer value for ${prefName}`);
      }

      defaults.setIntPref(prefName, prefValue);
      break;

    case "string":
      defaults.setStringPref(prefName, prefValue);
      break;
  }
}
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/**
 * addAllowDenyPermissions
 *
 * Helper function to call the permissions manager (Services.perms.add)
 * for two arrays of URLs.
 *
 * @param {string} permissionName
 *        The name of the permission to change
 * @param {array} allowList
 *        The list of URLs to be set as ALLOW_ACTION for the chosen permission.
 * @param {array} blockList
 *        The list of URLs to be set as DENY_ACTION for the chosen permission.
 */
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function addAllowDenyPermissions(permissionName, allowList, blockList) {
  allowList = allowList || [];
  blockList = blockList || [];

  for (let origin of allowList) {
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    try {
      Services.perms.add(origin,
                         permissionName,
                         Ci.nsIPermissionManager.ALLOW_ACTION,
                         Ci.nsIPermissionManager.EXPIRE_POLICY);
    } catch (ex) {
      log.error(`Added by default for ${permissionName} permission in the permission
      manager - ${origin.spec}`);
    }
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  }

  for (let origin of blockList) {
    Services.perms.add(origin,
                       permissionName,
                       Ci.nsIPermissionManager.DENY_ACTION,
                       Ci.nsIPermissionManager.EXPIRE_POLICY);
  }
}
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/**
 * runOnce
 *
 * Helper function to run a callback only once per policy.
 *
 * @param {string} actionName
 *        A given name which will be used to track if this callback has run.
 * @param {Functon} callback
 *        The callback to run only once.
 */
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 // eslint-disable-next-line no-unused-vars
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function runOnce(actionName, callback) {
  let prefName = `browser.policies.runonce.${actionName}`;
  if (Services.prefs.getBoolPref(prefName, false)) {
    log.debug(`Not running action ${actionName} again because it has already run.`);
    return;
  }
  Services.prefs.setBoolPref(prefName, true);
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  callback();
}

/**
 * runOncePerModification
 *
 * Helper function similar to runOnce. The difference is that runOnce runs the
 * callback once when the policy is set, then never again.
 * runOncePerModification runs the callback once each time the policy value
 * changes from its previous value.
 *
 * @param {string} actionName
 *        A given name which will be used to track if this callback has run.
 *        This string will be part of a pref name.
 * @param {string} policyValue
 *        The current value of the policy. This will be compared to previous
 *        values given to this function to determine if the policy value has
 *        changed. Regardless of the data type of the policy, this must be a
 *        string.
 * @param {Function} callback
 *        The callback to be run when the pref value changes
 */
function runOncePerModification(actionName, policyValue, callback) {
  let prefName = `browser.policies.runOncePerModification.${actionName}`;
  let oldPolicyValue = Services.prefs.getStringPref(prefName, undefined);
  if (policyValue === oldPolicyValue) {
    log.debug(`Not running action ${actionName} again because the policy's value is unchanged`);
    return;
  }
  Services.prefs.setStringPref(prefName, policyValue);
  callback();
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}