Firefox 89 - not a good first impression

[dmm]

The default color scheme suddenly became unusable (not enough contrast, everything is light gray on light gray). It turned out they "gifted" us with "a most significant upgrade in several years" ("Proton UI", "easier to use", "modernized", all the usual garbage one could expect from a modern software upgrade in the modern "let's make things unusable so the user knows who is the boss" style).

So, I was looking for a patch, and for the time being I installed this theme: addons.mozilla.org/en-US/firefox/addon/the_unknown_script/