+++ This bug was initially created as a clone of Bug #1587127 +++

Note

• The Google Search Results page is covered by an invisible frame and the content cannot be read.

Affected versions

• Nightly v72.0a1 from 2019-11-08
• Beta v71.0b7

Affected platforms

• Windows 10

Steps to reproduce

1. Activate Windows' feature, High Contrast mode.
2. Ensure "browser.display.permit_backplate" pref in about:config is set to True. (By default: true in Nightly and false in Beta)
3. Go to: https://www.google.com/search?client=firefox-b-1-d&q=test

Expected result

• Content is visible and readable.

Actual result

• Content is covered by some blank frame.

Additional notes

• It does NOT occur on the Release version and the release version does not even have the "browser.display.permit_backplate" pref by default.

Can you save the page you’re viewing as a full html document and attach it here? I don’t want to rely on the link alone as I’m unable to reproduce with that directly.

It appears to be location-dependent, and it reproduced for me when I used a VPN to pretend I was in Romania. (I think it may be an artifact of some dialog that google pops up, depending on your location.)

The page saves in a way that still reproduces it, too, so Morgan's now got a local testcase to work with.

I don't know whether this is still necessary, but here is the full HTML page archived. I hope it helps.

AFAIK, browser.display.permit_backplate is enabled for early betas only (https://searchfox.org/mozilla-central/source/modules/libpref/init/StaticPrefList.yaml#801) and is not available as a preference to flip outside of about:config so I am marking 71 as disabled.

I can't reproduce this with the given test file after landing 1594099. Does the issue persist for you after this change?

I attempted to regress the fix of this issue but wasn't able due to insufficient builds, so I thought to test your theory:

• Nightly v73.0a1 from 2019-12-10 build is affected.
• Nightly v73.0a1 from 2019-12-12build is unaffected.
  Even when attempting to regress the fix between these 2 dates, the same issue appears: bisection can't be completed due to insufficient builds.
  I cannot say that the push bug 1594099 fixed the issue, but I am sure you know better.

Furthermore, this issue does NOT occur anymore on Nightly v74.0a1 from 2020-01-13 or on Beta v73.0b4 or on Firefox ESR v68.4.1esr, but IT DOES reproduce on Firefox Release v72.0.1.

I don't know whether the firefox73 and firefox74 flags should be set as "fixed" or "unaffected" so please check my edit.

Thanks :danibodea! going to mark resolved:worksforme, since the backplate pref flip is being uplifted to 73 beta, and if the problem is only apparent in 72 (with backplate behind a pref) I'm not too worried about it.