The tabs that are not selected are so dark I cant read what the tab says
The Background color is a very dark blue on top where the tabs are
Chosen solution
Many of us are using Classic Theme Restorer (Customize Australis) {web link} Restore squared tabs, appmenu, add-ons bar, small button view and more on Australis UI (Windows/MacOSX/Linux + Fx 29+).
This will restore many of the things the last upgrade took away.
It also has the option for different colors tabs; active / not seen . . . . .
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Not active tabs are supposed to be transparent, the Windows desktop should show thru those tabs - unless you added a theme to Firefox. In that case, disable the theme or get a theme that has a lighter color background.
Start Firefox in Safe Mode to Troubleshoot the issue and to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
Chosen Solution
Many of us are using Classic Theme Restorer (Customize Australis) {web link} Restore squared tabs, appmenu, add-ons bar, small button view and more on Australis UI (Windows/MacOSX/Linux + Fx 29+).
This will restore many of the things the last upgrade took away.
It also has the option for different colors tabs; active / not seen . . . . .