Open Bug 1721605 Opened 3 years ago Updated 2 months ago

Tab drag image when dragging a tab flashes white even with Dark theme


(Firefox :: Tabbed Browser, defect, P3)

Firefox 92



Tracking Status
firefox-esr78 --- affected
firefox90 --- affected
firefox91 --- affected
firefox92 --- affected


(Reporter: cfogel, Unassigned)


(Blocks 1 open bug)


(Keywords: regressionwindow-wanted)


(1 file)

Attached image fqwe.gif

Affected versions

  • 92.0a1 - 20210719215029

Affected platforms

  • Win10;

Steps to reproduce

  1. Launch Firefox, pin 2 tabs;
  2. Grab 1 of the pinned tab and drag it across the bar so it would display the preview;

Expected result

  • preview loaded properly;

Actual result

  • preview is displayed as white(blank) for the first 1-2second(s) until it loads;

Regression range

  • will poke the QA team for further investigation, probably not a regression (but visible on dark-theme);

Additional notes

  • did not check on other OSs at this time;
  • attached GIF to illustrate the issue.
QA Whiteboard: [qa-regression-triage]

The issue in itself is not a recent regression, 77.0a1 and 79 ESR present the issue aswell. Also, it's not a theme related issue either, default theme and light theme also exhibit the issue.
However, after the initial investigation and first two failed attempts to identify a regression range, it is clear that in the latest few Nightlies the issue is far more obvious than in the previous versions, guessing that something on the preload area changed, but couldn't find anything relevant yet.

Duplicate of this bug: 1898886
Summary: Pinned tab - preview on initial grab&drag is white/blank → Tab drag image when dragging a tab flashes white even with Dark theme
Priority: -- → P3
You need to log in before you can comment on or make changes to this bug.