BB 33852: Clean up about:logins (LockWise) to avoid mentioning sync, etc.

Hide elements on about:logins that mention sync, "Firefox LockWise", and
Mozilla's LockWise mobile apps.

Disable the "Create New Login" button when security.nocertdb is true.

browser/components/aboutlogins/AboutLoginsParent.sys.mjs

@@ -49,6 +49,7 @@ ChromeUtils.defineLazyGetter(lazy, "AboutLoginsL10n", () => {
 const ABOUT_LOGINS_ORIGIN = "about:logins";
 const AUTH_TIMEOUT_MS = 5 * 60 * 1000; // 5 minutes
 const PRIMARY_PASSWORD_NOTIFICATION_ID = "primary-password-login-required";
+const NOCERTDB_PREF = "security.nocertdb";
 
 // about:logins will always use the privileged content process,
 // even if it is disabled for other consumers such as about:newtab.
@@ -320,6 +321,7 @@ export class AboutLoginsParent extends JSWindowActorParent {
           Services.policies.isAllowed("profileImport") &&
           AppConstants.platform != "linux",
         preselectedLogin: this.preselectedLogin,
+        canCreateLogins: !Services.prefs.getBoolPref(NOCERTDB_PREF, false),
       });
 
       await AboutLogins.sendAllLoginRelatedObjects(

browser/components/aboutlogins/content/aboutLogins.css

@@ -62,6 +62,11 @@ login-item[data-editing="true"] + login-intro,
   display: none;
 }
 
+/* Do not promote Mozilla Sync. */
+login-intro {
+  display: none !important;
+}
+
 .heading-wrapper {
   display: flex;
   justify-content: center;

browser/components/aboutlogins/content/aboutLogins.mjs

@@ -24,6 +24,9 @@ const gElements = {
       ".menuitem-remove-all-logins"
     );
   },
+  get createNewLoginButton() {
+    return this.loginList.shadowRoot.querySelector(".create-login-button");
+  },
 };
 
 let numberOfLogins = 0;
@@ -129,6 +132,9 @@ window.addEventListener("AboutLoginsChromeToContent", event => {
       gElements.loginList.setSortDirection(event.detail.value.selectedSort);
       document.documentElement.classList.add("initialized");
       gElements.loginList.classList.add("initialized");
+      if (!event.detail.value.canCreateLogins) {
+        gElements.createNewLoginButton.disabled = true;
+      }
       break;
     }
     case "ShowLoginItemError": {

browser/components/aboutlogins/content/components/fxaccounts-button.css

@@ -8,6 +8,11 @@
   align-items: center;
 }
 
+/* Do not promote Mozilla Sync. */
+.logged-out-view {
+  display: none !important;
+}
+
 .fxaccounts-extra-text {
   /* Only show at most 3 lines of text to limit the
      text from overflowing the header. */