Describe the bug
In latest 68.0a2 tabs background is black with Default or Light theme. Because those themes use black text, this leaves the tab unreadable and visually unusable.
To Reproduce
Tools > Add-ons Manager > Themes, enable either Default or Light
Expected behavior
Tabs should be gray/light-gray with black text.
Screenshots

Desktop (please complete the following information):
Additional context
Sometimes the tabs look as expected briefly after a restart. But as the browser is used, e.g. if the Add-ons Manager is opened, it will revert back to the unusable black background.
The black background also happens with Dark theme and with personas, but in those cases the text is white and light grey respectively, so one workaround could be to use either Dark theme or a persona.
68.0a2 on Windows (to the right), default theme:

– and light:

Reproducible with (unannounced) build 20190906171246 of 68.0b1:

Below, the bug is not immediately apparent – it occurs (for example):
Another example, thanks to @troysjanda:
… and so on.
Cross references:
Hmm, will see look into why the CSS isn't unregistering properly.
Hmm, will see look into why the CSS isn't unregistering properly.
@MrAlex94 Because it's being reapplied by this code -
https://github.com/MrAlex94/Waterfox/blob/ab1960eee6162fd2b824118e3208414013718f7d/toolkit/mozapps/extensions/internal/AddonSettings.jsm#L67-L72
That’s correct, looks like I missed out the unregister code I used when
testing.
On Thu, 19 Sep 2019 at 00:00, laniakea64 notifications@github.com wrote:
Hmm, will see look into why the CSS isn't unregistering properly.
@MrAlex94 https://github.com/MrAlex94 Because it's being reapplied by
this code -—
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.
Fixed by https://github.com/MrAlex94/Waterfox/commit/0e1ff89a741a6853547465dd0d5d6ae9ffad6684 . Thanks! :+1:
Most helpful comment
That’s correct, looks like I missed out the unregister code I used when
testing.
On Thu, 19 Sep 2019 at 00:00, laniakea64 notifications@github.com wrote: