I've noticed that this doesn't happen on Microsoft Edge, so I guess this is a Firefox only problem. Seeing that this hasn't been blogged about before, I suppose this could be a problem on my side.
Parts of the website are completely unreadable, unless text is selected. How can I fix this?
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Cannot reproduce with Firefox on my machine (regard of whether I logged in or not). Could it be that you enabled some user script or user style sheet?
Disabling all my addons does nothing.
It works fine on my laptop. I think the firefox files got corrupted. Try reinstalling firefox.