Affected versions

• 100.0a1 (20220323214810)
• 99.0b7
• 98.0.2

Affected platforms

• Windows 10x64

Preconditions

• Windows dark theme selected

Steps to reproduce

1. Open Firefox and set the Alpenglow theme.
2. Open the Customize menu and observe the Title bar checkbox.

Expected result

• The checkbox is visible.

Actual result

• The checkbox is barely visible.

Regression range

• Last good revision: 340719f2946c85bb8df494cb4740129e5a5078af
  First bad revision: 6d22ab00f3133b6760ebca3943dba097eff853c7
  Pushlog:
  https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=340719f2946c85bb8df494cb4740129e5a5078af&tochange=6d22ab00f3133b6760ebca3943dba097eff853c7

Notes

• Screenshot attached.
• Not reproducible on Ubuntu 21 and macOS 12.

:emilio, since you are the author of the regressor, bug 1734115, could you take a look?
For more information, please visit auto_nag documentation.

As far as I can tell, we are not using native colors here. This block makes the buttons light, but doesn't make the checkbox light and it probably should.

That works nicely for both light and dark mode.

One additional step in the STR that's critical for testing - on Windows, you must set the "default app mode" for Colours to "Dark" in order to get the dark background in the customization palette.

https://hg.mozilla.org/mozilla-central/rev/67bff9e4ad11

Verified fixed with Firefox 100.0b7 (20220417185951) on Windows 10x64. The Title bar check box is visible inside Customize menu with the Alpenglow theme and Dark OS theme.