Rebase Mullvad Browser to 102.9.0esr

Merge Info

Related Issues

• #103 (closed)

Backport Timeline

• Immediate - patchsets for critical bug fixes or other major blocker (e.g. fixes for a 0-day exploit) OR patchsets with trivial changes which do not need testing (e.g. fixes for typos or fixes easily verified in a local developer build)
• 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 - patchset for the next major stable

Issue Tracking

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

Change Description

cherry-picked mullvad-browser commits onto base-browser-102.9.0esr-12.0-1-buidl1. Autosquashed previous build tag's commits and moved subsequent fixups next to their parent commits. Had to split the most recent branding fixup as it was modifying a file for about:mullvad-browser (which is not added until the MB 39 commit).

Additionally the location of the disable the extension signing check has swapped with the legacy webcam indicator disable pref. Beyond that diff of diffs is as expected.