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Settings Check mark box Firefox 91

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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.

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.
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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.