Dark theme causes websites to appear washed out
After installing Firefox for android I noticed that webpages were appearing very washed out, colours faded, blacks rendered as grey etc. It seems similar to this issue https://support.mozilla.org/en-US/questions/1329680 Trying the resolution there I noticed that about:config just loads as a blank page.
The issue is dependent on the theme active when tab was created. For example if the browser is in light theme and a tab is created, then you change to dark mode, pages will continue to render vibrant until a new tab is created. Conversely changing to light mode pages will remain faded until a new tab is created.
This behavior is also present if the Theme is set to follow OS if OS dark pages are faded, if OS light pages appear normal.
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Also if it matters Firefox Focus dark mode works without pages fading, FireFox Beta and FireFox Nightly both have the fading page issues. The device affected is a Samsung Tab S8 Ultra. I just tested on a Samsung S22 Ultra and there is no issue with dark theme on this device.