Backport Bugzilla 1999126: Protect whether PDF.js is enabled/disabled to improve fingerprinting protection

⬅️ Backport Patchset

Bookkeeping

Issue(s)

• tor-browser#
• mullvad-browser#
• https://bugzilla.mozilla.org/show_bug.cgi?id=1999126 (commit 3c75fa7e4427c47b2af3625677daba309d06ce12)

Merge Request(s)

• tor-browser!

Target Channels

• Alpha
• Stable
• Legacy

Notes

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