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Extend prefers-contrast rules to include forced-colors

henry requested to merge henry/tor-browser:handle-forced-colors-bug-42746 into tor-browser-128.2.0esr-14.0-1

Merge Info

Related Issues

Backporting

Timeline

  • Immediate: patchset needed as soon as possible
  • Next Minor Stable Release: patchset that needs to be verified in nightly before backport
  • Eventually: patchset that needs to be verified in alpha before backport
  • No Backport (preferred): patchset for the next major stable

(Optional) Justification

  • Emergency security update: patchset fixes CVEs, 0-days, etc
  • Censorship event: patchset enables censorship circumvention
  • Critical bug-fix: patchset fixes a bug in core-functionality
  • Consistency: patchset which would make development easier if it were in both the alpha and release branches; developer tools, build system changes, etc
  • Sponsor required: patchset required for sponsor
  • Localization: typos and other localization changes that should be also in the release branch
  • Other: please explain

Merging

  • Merge to tor-browser - !fixups to tor-browser-specific commits, new features, security backports
  • Merge to base-browser - !fixups to base-browser-specific commits, new features to be shared with mullvad-browser, and security backports
    • NOTE: if your changeset includes patches to both base-browser and tor-browser please clearly label in the change description which commits should be cherry-picked to base-browser after merging

Issue Tracking

Review

Request Reviewer

  • Request review from an applications developer depending on modified system:
    • NOTE: if the MR modifies multiple areas, please /cc all the relevant reviewers (since gitlab only allows 1 reviewer)
    • accessibility : henry
    • android : clairehurst, dan
    • build system : boklm
    • extensions : ma1
    • firefox internals (XUL/JS/XPCOM) : jwilde, ma1
    • fonts : pierov
    • frontend (implementation) : henry
    • frontend (review) : donuts, richard
    • localization : henry, pierov
    • macOS : clairehurst, dan
    • nightly builds : boklm
    • rebases/release-prep : dan, ma1, pierov, richard
    • security : jwilde, ma1
    • signing : boklm, richard
    • updater : pierov
    • windows : jwilde, richard
    • misc/other : pierov, richard

Change Description

Regarding the upstream changes mentioned in #42746 (closed). In general I think we should stick to the firefox theme whenever either prefers-contrast or forced-colors is present. And only add our Tor theme when they aren't present.

So I extended our existing prefers-contrast rules to include forced-colors. I also added a border around #tor-check to stand out with forced-colors.

NOTE: We likely need these kind of rules in a few other places, but I'm opening a different issue for that.

How Tested

Ran my dev build with TOR_SKIP_LAUNCH=1 environment to see the #tor-check box. Adjusted my desktop theme (GNOME) to be high contrast. Also adjusted the website colors in "Languages and Appearances, Manage Colors" to induce forced colors for content pages.

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