Open Bug 1535067 Opened 1 year ago Updated 5 months ago

Firefox window gets smaller every time the browser is opened


(Firefox :: Session Restore, defect, P2)




Tracking Status
firefox65 --- affected
firefox66 --- affected
firefox67 --- affected


(Reporter: dmajor, Unassigned)


(Blocks 1 open bug)


Tested on: Windows 10, High DPI (225%), Firefox Nightly 2019-03-13


  • Open Firefox
  • Resize it to the same height as some other running app, for comparison
  • Repeatedly exit and re-launch Firefox

The window gets a few pixels shorter every time. It does not happen at 100% nor 200% OS scaling settings, only 225%. At first guess I suspect a rounding issue.

This got in the way of me doing Speedometer test runs because eventually the page got cut off.

Hi, I managed to reproduce this issue in all versions of Firefox with a scaled Windows 10 to 225%.

Component: Untriaged → Startup and Profile System
Product: Firefox → Toolkit

This seems very similar to bug 1493472, maybe a dupe. Interesting to know this happens only with some DPI settings!

Component: Startup and Profile System → Session Restore
Product: Toolkit → Firefox
Priority: -- → P2
See Also: → 1493472
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