Open Bug 1635105 Opened 3 years ago Updated 3 years ago

Firefox becomes unresponsive when more tools is closed while having search bar and forget window opened


(Firefox :: Toolbars and Customization, defect, P3)




Tracking Status
firefox-esr68 --- unaffected
firefox75 --- wontfix
firefox76 --- wontfix
firefox77 --- wontfix
firefox78 --- fix-optional


(Reporter: atrif, Unassigned, NeedInfo)



(Keywords: regression)


(2 files)

Attached image freeze.gif

Affected versions

  • 77.0a1 (20200503214759)
  • 76.0 (20200429185419)
  • 75.0 (20200403170909)

Affected platforms

  • Windows 10x64


  • Have the search bar and forget options added to the overflow menu from Customize.

Steps to reproduce

  1. Open Firefox and click on the More tools menu.
  2. Select the search bar and type a random word.
  3. Click on the Forget option.
  4. Select the More tools option again from the URL bar.

Expected result

  • Overflow menu is closed and no freeze occurs.

Actual result

  • Firefox becomes unresponsive and this error is presented after a while.

Regression Range
Last good revision: 55f5d719d0359a35443d0d2586af7383645a94b6 (2019-09-24)
First bad revision: 15ffd69c83be752a28fc40a5db6b6859452fa41f (2019-09-25)
Possible regressor bug 1582797.


  • Attached a screen recording.

Sorry, I miss clicked the flags.

Severity: -- → S3
Has Regression Range: --- → yes
Has STR: --- → yes

Also when this error is presented after clicking Stop script on the error from comment 0 the attached message is shown in the browser console.

Dão, can you take a look? Are we getting resize events from the wrong code, or is the popuphidden/popupshown code added in perhaps firing for the autocomplete popup from the search widget and interfering with things that way, or something?

Flags: needinfo?(dao+bmo)
See Also: → 1635088
Priority: -- → P3
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