New Tab "+" button is squished on KDE

[The-EDev]

Using Firefox 89.0.2 on KDE Plasma 5.21.5-1

The + button is squished (width > height). Also the very bottom of the URL bar is clipped.

The first was fixed by changing the value here to 36px:

fx-compact-mode/userChrome.css

Line 24 in f0f5145

--tab-min-height: 31px !important;

I'll see if I can fix the second.
Edit:
I managed to fix the second by editing this value to 36px (seems like that's the magic number):

fx-compact-mode/userChrome.css

Line 52 in f0f5145

--urlbar-container-height: 30px !important;

[dannycolin]

I can't reproduce this issue on my side. Do you also have other modifications in your userChrome.css?

[The-EDev]

I don't have any other modifications in userChrome.css

This is the + sign with the default values:

This is with the modified values: