The blurriness in comment #4 is expected. Any apps which don't natively support scaling will be scaled by the compositor, which means they will either appear blurry or unevenly pixelated. We choose blurry. So this is not a mutter or gnome-shell bug. It is however a Firefox bug for not supporting scaling.
As for the black frame in comment #5, that is a different issue. That is bug 1751593.
Thanks!
The blurriness in comment #4 is expected. Any apps which don't natively support scaling will be scaled by the compositor, which means they will either appear blurry or unevenly pixelated. We choose blurry. So this is not a mutter or gnome-shell bug. It is however a Firefox bug for not supporting scaling.
As for the black frame in comment #5, that is a different issue. That is bug 1751593.