Settings Check mark box Firefox 91
In Firefox 91.0 if you go to Settings if you try to put a check mark in one (any) of the boxes nothing happens.
There is no way to tell whether there was a check mark there or not.
Alla svar (1)
This happens if you have set "browser.proton.enabled = false" to disable Proton.
In Firefox 91+ you can no longer disable Proton via "browser.proton.enabled = false" on the about:config page. Best is to leave browser.proton.enabled at its default true value as the false setting can cause issues.
In Firefox 91+ you need to use code in userChrome.css to override changes coming with the Proton design.