Description of problem:
On Firefox 91, go to the Settings (i.e. about:preferences). Instead of tick-boxes, there is a small dot. This makes it impossible to tell whether a preference is on or off.
This worked correctly on Firefox 90.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
I cannot reproduce the bug.
Does the bug still appear using a fresh profile?
Could you attach the content of about:support page here, I would like to try out your settings.
Created attachment 1814932 [details]
Example of the lack of tickbox in Firefox 91
I used a fresh profile as you suggested and indeed the problem didn't appear.
Investigating further, I noticed that all my Firefox 91 installs were affected in the same way, even the windows standard Mozilla one (where the tickboxes appear just as empty boxes - never ticked - instead of dots as shown in the attachment above, which shows the Fedora Firefox 91.)
The offending config is:
Toggling this to the default true corrects the Settings tickboxes in real time.
So I can solve my problem. However, it shouldn't be possible to corrupt the interface by setting a config.
1) Other tickboxes (not in Settings) appear to be OK. (e.g. 'Warn me when I attempt to access these preferences' on about:config).
2) Firefox 92 Beta (currently 92.0b4) installed from standard Mozilla on Fedora does NOT show this error, even though browser.proton.enabled is set false. Firefox Nightly on Windows also has browser.proton.enabled false, and also does NOT show this error.
Thus, it appears that the problem is specific to all versions of Firefox 91.0.
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