At least here, disappearance of Recent Folders tab...
Good catch - I did some diffing, it happened between pre37 and pre40 - I tried to fix some coloring issue with JS code. Now it's a pure CSS solution.
Note the paintbrushes having same color as the text.
The "Paint Mode" command doesn't generate a dropdown menu to select a palette entry / end paint mode:

Ibserved Behavior:

When clicked again, it only displays an empty menu square:
Expected behavior - a palette menu should be displayed:

yet another regression from the upgrade to Thunderbird 78
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