[BUG] Inactive tab has translucency

[mciarlo]

Describe the bug After uninstalling all theming plugins and reverting to the default theme, the inactive tabs don't appear to use opaque colors.

To Reproduce Steps to reproduce the behavior:

1. Install theme version 1.2.2
2. Restart Firefox
3. Observe inactive tabs and the "+" tab button have macOS style translucency.

Expected behavior The tabs are opaque.

Screenshots

Desktop (please complete the following information):

• OS: macOS 10.15.7
• Firefox version 88.01
• WhiteSur theme 1.2.2
• Installed by dragging the folders to my profile folder

[AdamXweb]

I'll look into making a permanent fix, however the best option is to choose the dark theme that comes with Firefox. This'll allow the theme to look like how it was shown!

[AdamXweb]

May also have another example on Reddit

[AdamXweb]

bb2b7d757c2fb6f4c79d97977e099d19ea7f7edf