STR:

1. Set widget.macos.respect-system-appearance to true.
2. Enable macOS dark mode.
3. Enable "Increase contrast" in Accessibility.
4. Go to about:profiles.

Expected results:
White text and dark background.

Actual results:
White text and white background.

When "Increase contrast" is enabled, Firefox uses -moz-Dialog for the in-content page background. At the moment, -moz-Dialog resolves to rgba(255, 255, 255, 0.098) in dark mode. This is a very low-opacity white color, rather than an opaque dark color. It seems to be intended to be used on top of a dark backdrop.

I'm getting this on other in-content pages, like about:preferences, about:config, and about:sessionrestore.

Backed out changeset 56aa4be0522c (Bug 1710164) for causing bustages in nsLookAndFeel.mm

Push with failures: https://treeherder.mozilla.org/jobs?repo=autoland&group_state=expanded&collapsedPushes=842382&resultStatus=testfailed%2Cbusted%2Cexception%2Cretry%2Cusercancel&revision=56aa4be0522c12a278dea513f518054500f90d3c&selectedTaskRun=N5xt_VZBQpeTWOrW7goB_w.0

Log: https://treeherder.mozilla.org/logviewer?job_id=342308808&repo=autoland&lineNumber=44933

Backout: https://hg.mozilla.org/integration/autoland/rev/00293b1648497346f790d2725fdafce3bcdad1a4

https://hg.mozilla.org/mozilla-central/rev/3ec370f03e4d

Hello,

Managed to reproduce this issue on 90.0a(120210507095221), with macOS 11 device.

Confirming this issue as verified fixed on 90.0b8(20210615190254) and 91.0a1(20210617095423) using macOS 11 and macOS 10.15.7

Are sure this is fixed on Firefox 90? The code fix only landed on Firefox 91 and wasn't uplifted. When you tested Firefox 90 did you set widget.macos.respect-system-appearance to true?

Hello Mathew.

Yes I have set widget.macos.respect-system-appearance to true. and yes, this issue was only verified in 91.0a1(20210617095423).