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- about:tor fix to prevent showing 'something went wrong page' after about:torconnect bootstrap
- directly including tor-browser's onion-pattern xhtml/css rather than duplicating
- about:tor polish: replaced png with svg icons for ddg (from ddg), mail and arrow (photon UI included from firefox)

This reverts commit d27b2be2.

Revert "Bug 40029: Create survey banner on about:tor for snowflake"

This reverts commit 10ce74fa.

Revert "fixup! Bug 40026: Add feedback survey banner"

This reverts commit ac4114cd.

Revert "Bug 40026: Add feedback survey banner"

This reverts commit edad4c65.

This reverts commit 77566f61.

This reverts commit 0675516f.

This reverts commit 65b6f322.

This reverts commit 86c73f63.

This reverts commit 983c073b.

See tor-browser#40287

Also, eliminate extra "b" parameter from the search form. The
presence of "b" would reveal that the search was initiated from
the landing page, rather than the urlbar.

The torbutton does not exist anymore, so removing related
code that is now unused, like the new browser version
flashing warning and others.

Closes #28745.

Since Tor Browser 9.0 (when the Onion Button was removed), Torbutton's
internal browser version check is no longer hooked up to any UI. But it
was still chugging along - making requests and logging to the Browser
Console.

Delete it, along with some now unnecessary support code.

Bug 40022: EOY November Update - Matching

Bug 40021: Keep page shown after Tor Browser update purple