What's your setting of ```widget.non-native-theme.enabled``` in about:config?
Bug 1751367 Comment 17 Edit History
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>Ran mozregression, On Windows 10, Aurora/DevEdition 98.0b2 this change seems to cause super-tiny and differently-styled HTML checkboxes somehow. Unintended, i presume?
What's your setting of ```widget.non-native-theme.enabled``` in about:config?