Text highlight color is wrong

Firefox now seems to force a blue highlight color while highlighting text. Seems to be a bug introduced in https://bugzilla.mozilla.org/show_bug.cgi?id=2048483

All `::selection` rules in both userChrome and userContent dont have any effect. In fact, they stopped working in v154, while it was working fine in v153. Why would they push an update with broken highlighting? Some pages stopped showing the right highlight color as well, if they use `!important` in the rule.

Start by reviewing the `::selection` rules in both userChrome and userContent, then reproduce the behavior in Firefox v153 and v154. Check the linked Bugzilla report for the change behind the regression; the work is done when the intended highlight colors apply again in the affected contexts.

Written by the indexing model from the issue text.