Messed up text in firefox

So I don’t know how to describe this issue other than to say text is impossible to read on Firefox anymore.
Everything’s highlighted or colors are inverted, etc.

Also changing font and colors in Options didn’t help.

I suggest you fill a bug to https://bugzilla.mozilla.org/describecomponents.cgi?product=Core&component=Graphics#Graphics.

what extensions do you have installed?