Emilio Cobos Álvarez 325bc7b486 Bug 1859538 - Allow chrome stylesheets to be parsed in parallel. r=layout-reviewers,desktop-theme-reviewers,dao,Gijs,tlouw
This changes -moz-bool-pref from @supports to @media, bringing various
improvements:

 * @media (-moz-bool-pref) properly reacts to dynamic changes.
 * We no longer need to parse chrome:// stylesheets in the main thread
   (-moz-bool-pref was the only thing that forced us to do that).

This makes privileged and non-privileged stylesheets more similar.

Differential Revision: https://phabricator.services.mozilla.com/D191196
2023-10-19 10:50:27 +00:00
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