Bug 42037: Disable about:firefoxview page

Merge Info

Related Issues

• #42037 (closed)

Backporting

Timeline

• Immediate: patchset needed as soon as possible
• Next Minor Stable Release: patchset that needs to be verified in nightly before backport
• Eventually: patchset that needs to be verified in alpha before backport
• No Backport (preferred): patchset for the next major stable

(Optional) Justification

• Emergency security update: patchset fixes CVEs, 0-days, etc
• Censorship event: patchset enables censorship circumvention
• Critical bug-fix: patchset fixes a bug in core-functionality
• Consistency: patchset which would make development easier if it were in both the alpha and release branches; developer tools, build system changes, etc
• Sponsor required: patchset required for sponsor
• Other: please explain

Merging

• Merge to tor-browser - !fixups to tor-browser-specific commits, new features, security backports
• Merge to base-browser - !fixups to base-browser-specific commits, new features to be shared with mullvad-browser, and security backports
  • NOTE: if your changeset includes patches to both base-browser and tor-browser please clearly label in the change description which commits should be cherry-picked to base-browser after merging

Issue Tracking

• Link resolved issues with appropriate Release Prep issue for changelog generation

Review

Request Reviewer

• Request review from an applications developer depending on modified system:
  • NOTE: if the MR modifies multiple areas, please /cc all the relevant reviewers (since gitlab only allows 1 reviewer)
  • accessibility : henry
  • android : clairehurst, dan
  • build system : boklm
  • extensions : ma1
  • firefox internals (XUL/JS/XPCOM) : ma1
  • fonts : pierov
  • frontend (implementation) : henry
  • frontend (review) : donuts, richard
  • localization : henry, pierov
  • macos : clairehurst, dan
  • nightly builds : boklm
  • rebases/release-prep : dan, ma1, pierov, richard
  • security : ma1
  • signing : boklm, richard
  • updater : pierov
  • misc/other : pierov, richard

Change Description

Followed similar about:foo removal patches we have, disabled about:firefoxview an about:firefoxview-next

How Tested

Haven't tested need to do a local build tomorrow. Leaving as a DRAFT until then and will undraft once its ready for review.

browser/app/profile/001-base-profile.js

@@ -18,7 +18,7 @@ pref("startup.homepage_welcome_url.additional", "");
 pref("browser.aboutwelcome.enabled", false);
 
 // Disable the Firefox View tab (tor-browser#41876)
-pref("browser.tabs.firefox-view", false);
+pref("browser.tabs.firefox-view", false, locked);
 
 // Disable 'Switching to a new device" help menu item (tor-browser#41774)
 pref("browser.device-migration.help-menu.hidden", true);