Affected versions

• Firefox 68.0.1 (20190717172542)
• Firefox 69.0b6 (20190718172058)
• Firefox 70.0a1 (20190718215316)

Affected platforms

• Windows 10x64
• Windows 7x64

Preconditions

• Enable High Contrast (Settings -> Ease of Access -> High Contrast -> Turn on high contrast).

Steps to reproduce

1. Launch Firefox and go to about:addons page.
2. Select the Themes category.
3. Observe the ellipsis (3-dot) icon from the Default, Dark or Light themes.

Expected result

• There are no visual glitches when using high contrast.

Actual result

• The ellipsis (3-dot) icon from the themes is not present and it’s replaced with an empty square.

Regression Range

• Reproducible with Firefox 69.0a1 (20190615214733). I will search for one ASAP.

Additional Notes

• The issue is reproducible on every installed addon that has the 3-dot icon.
• Attached a screenshot with the issue.

Bugbug thinks this bug is a regression, but please revert this change in case of error.

Hello!
I tried searching for a regression range but with no luck, because the issue is reproducing way back to the implementation of the ellipsis (3-dot) icon (20190317213820). I will remove the flags accordingly. If there is anything I cand help with please let me know. Thank you!

Looks like to fix that icon we'll need to switch it from a background image to a regular image or <input type="image">.

In addition there is also no active state in the sidebar, no hover states in the more options menu, no visual component to the separators in the menu (should use border-top instead of being 1px w/ background), and the borders for the tabs on the details page are a little weird.

hello! I think this is fixed as of readability backplate landing. can you confirm if the issue persists in nightly? (with permitBackplate enabled in about:config)

Hello! It seems that the issue is fixed on the latest Nightly 74.0a1 (20200113204142) and Firefox 73.0b4 (20200112220634). On high contrast mode, the 3-dot ellipsis is shown accordingly: screenshot.
Closing this as works for me and modifying the flags. Thank you!