Draft: Rebase patches onto 91.0.1

Matthew Finkelrequested to merge
sysrqb/tor-browser:bug_40461_06 into tor-browser-91.0.1-11.0-2

Closes #40461 (closed)

Four significant changes visible in a range-diff:

  1. browser/base/content/browser.xhtml was refactored in 44b50331
  2. browser/base/content/aboutNetError.{js,xhtml} was moved to browser/base/content/certerror/aboutNetError.{js,xhtml} in 69e599d8
  3. Mozilla re-styled the build system config files to use double-quotes instead of single.
  4. Mozilla converted C-literal strings from NS_LITERAL_CSTRING to _ns in cd8b8939

This branch merges our two branches: esr and rapid release.

cc @richard

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