Hi!
Im using Zorin 16 and in Mozilla i see strange things. Look at this button. Only in mozilla i see this things
I just went to a facebook login page on my Mozilla Firefox 89.0.1 and while mine looks normal, I opened the Inspector and looked at at the html5 and the css. Everything there is normal. So, the likeliest cause is the rendering engine.
You might try checking your Firefox build version:
firefox --version
and seeing if an update is available. Simplest is to up everything:
sudo apt full-upgrade
Or rebuild / reinstall firefox:
sudo apt install --reinstall firefox
Other than that; This is a Mozilla Issue, not a Zorin or a Facebook issue.
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