Closed Bug 1765685 Opened 2 months ago Closed 2 months ago

Massive flickering glitches on Customization page (content from previous tab, transparent window, smeared content)


(Firefox :: Theme, defect)




101 Branch
Tracking Status
firefox-esr91 --- unaffected
firefox99 --- wontfix
firefox100 --- verified
firefox101 --- verified


(Reporter: jan, Assigned: emilio)


(Blocks 1 open bug, Regression)


(Keywords: correctness, nightly-community, regression)


(3 files)

Attached video 2022-04-21_04-25-01.mp4

Debian Testing, Gnome Wayland, Intel


  1. Install,
  2. right click on toolbar, click "Customize Toolbar",
  3. resize browser.

mozregression --good 2021-06-01 --bad 20220420215300 -a

16:24.77 INFO: Last good revision: e3ed61b61357e78f89a316d68dd5cc69ffd099ac
16:24.77 INFO: First bad revision: eb8c23dda78d3ed4bf244c3e72c76e81833086ff
16:24.77 INFO: Pushlog:

eb8c23dda78d3ed4bf244c3e72c76e81833086ff Emilio Cobos Álvarez — Bug 1509931 - Use titlebar radius on Linux and make titlebar set-up work for lightweight themes. r=stransky,dao

Attached file aboutsupport.txt

mozregression --launch 20220420215300 -a -a about:support

$ dpkg -l libgtk-3-common mutter-common libegl-mesa0 *adwaita*

adwaita-icon-theme 42~really41.0-1
libadwaita-1-0:amd64 1.1.0-1
libegl-mesa0:amd64 21.3.7-1
libgtk-3-common 3.24.33-1
mutter-common 42.0-3

:emilio, since you are the author of the regressor, bug 1509931, could you take a look?
For more information, please visit auto_nag documentation.

Flags: needinfo?(emilio)

I think the theme does not specify background color or background color is transparent.

Assignee: nobody → emilio
Flags: needinfo?(emilio)

The Linux compositor relies on the tab area being fully opaque, all the
time. This I'm almost sure also fixes bug 1762379, since alpenglow also
has a semi-transparent toolbar-bgcolor.

Why does transparency flicker this way?
Is gtk double buffering still enabled somewhere (bug 1502519 comment 27)?

Duplicate of this bug: 1762379
Pushed by
Ensure customization mode is opaque. r=dao
Component: Widget: Gtk → Theme
Product: Core → Firefox
Closed: 2 months ago
Resolution: --- → FIXED
Target Milestone: --- → 101 Branch

The patch landed in nightly and beta is affected.
:emilio, is this bug important enough to require an uplift?
If not please set status_beta to wontfix.

For more information, please visit auto_nag documentation.

Flags: needinfo?(emilio)

Comment on attachment 9273211 [details]
Bug 1765685 - Ensure customization mode is opaque. r=dao

Beta/Release Uplift Approval Request

  • User impact if declined: flickering in customize mode with some themes.
  • Is this code covered by automated tests?: No
  • Has the fix been verified in Nightly?: Yes
  • Needs manual test from QE?: Yes
  • If yes, steps to reproduce: comment 0 and duplicate bug.
  • List of other uplifts needed: none
  • Risk to taking this patch: Low
  • Why is the change risky/not risky? (and alternatives if risky): Pretty simple CSS change.
  • String changes made/needed: none
  • Is Android affected?: No
Flags: needinfo?(emilio)
Attachment #9273211 - Flags: approval-mozilla-beta?
Flags: qe-verify+

Comment on attachment 9273211 [details]
Bug 1765685 - Ensure customization mode is opaque. r=dao

Approved for 100.0rc1

Attachment #9273211 - Flags: approval-mozilla-beta? → approval-mozilla-release+
QA Whiteboard: [qa-triaged]


Reproduced this issue on Ubuntu 20.04 with 101.0a1(20220419214607).

Confirming this issue as verified fixed on Ubuntu 20.04 with 101.0a1(20220426094609) and 100.0 20220425210429.

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