Honestly, I understand the complexity of this issue but can we just make
Firefox ignore the GTK theme completely from within the viewport? I
don't think it makes sense to make the GTK theme dictate what is going
on inside of the viewport.
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You received this bug notification because you are a me
To clarify, instead of Firefox trying to make an informed decision based
on the system/GTK theme, can Firefox just default to the colours
specified in the Content tab in Colors and pretend that GTK doesn't
exist? (only in the viewport)
the only alternative to this problem is to install extensions