This prevents contrast issues with high contrast themes when the page only
specifies some of the colors (which is an issue which we have historically
had on GTK with dark themes for a long time).
Feel free to push back on this if you prefer this, as on GTK we force a light
theme on content anyways, but this is a problem on windows for users that use a
high contrast theme but allow pages to override colors.
Differential Revision: https://phabricator.services.mozilla.com/D108324
This was a follow-up from the backplate stuff which I requested but didn't
happen.
Differential Revision: https://phabricator.services.mozilla.com/D53170
--HG--
extra : moz-landing-system : lando
We really only have two sets of prefs, one for chrome-like documents
(stuff in chrome docshells + chrome-origin images), and one for the rest.
Differential Revision: https://phabricator.services.mozilla.com/D20946
--HG--
extra : moz-landing-system : lando