Draft: Rebase fenix patches to fenix v89.0.0-beta.5

Matthew Finkelrequested to merge
sysrqb/fenix:bug_40164_01 into tor-browser-89.0.0b5-10.5-1

Closes #40164 (closed)

The range-diff is messy. @boklm resolved all of the conflicts up to boklm/fenix@f3c35ff3.

  • I tweaked the Add Tor integration patch due to 990bfa7e. (fixup is sysrqb/fenix@5028b32d)
  • The Modify UI/UX patch diff is complicated because Mozilla re-ordered menu items.
  • Mozilla added getSetDefaultBrowserItem, but that is controlled by a Nimbus experiment so there isn't any impact on Tor Browser.
  • They added an allow_domestic_china_fxa_server preference. It is hidden when the user is not signed into Sync, but I changed the default visibility in any case.
  • In preferences.xml and preferences_without_icons.xml I made small changes to follow the existing style (space before /> in xml)

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