Bug 43450: Rebase legacy onto 115.20.0esr

Merge Info

Rebase Issue

• #43450 (closed)
• mullvad-browser#xxxxx

Release Prep Issue

• tor-browser-build#41351 (closed)

Issue Tracking

• Link rebase issue with appropriate Release Prep issue for changelog generation

Review

Request Reviewer

• Request review from a release engineer: boklm, dan, ma1, morgan, pierov

Change Description