1383057 - When pressing F6 while the mouse cursor is over a tab so that the tab's title is shown as tooltip, Firefox stops responding.

Status: RESOLVED WORKSFORME

(Firefox :: Tabbed Browser, defect)

Description

[ertl.maxi]

Attachment: Screenshot of a tab and its tooltip.

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3159.5 Safari/537.36

Steps to reproduce:

1. Hover above any open tab until its title is shown in a tooltip (see attached screenshot).
2. Press F6 to move the cursor to the Address bar

Tested and reproduced on:
a.) FF 54.0.1 (64-Bit) on Win10 Pro Insider Preview, build 16241.1001
b.) FF 54.0.1 (64-Bit) on Win10 Enterprise, build 14393.0 (3 identical machines)

Tested and NOT reproduced on:
c.) FF 54.00.1 (x64) on Arch Linux x86_64 Kernel 4.11.3-1


Actual results:

Firefox hangs, any further interaction will bring up Windows' "Firefox isn't responding. Wait/Close" dialog.


Expected results:

The cursor should be moved to the Address bar and the text in it (ie the URL of the current webpage) should be selected.

Comment 1

[Stefan [:StefanG_QA]]

I've used mozregression to find a regression range. Here are my findings: 

Last good revision: 66e7178c31542d5cc6f893c3998ad17bf6845075
First bad revision: 586d65b40b24824331a16be1fe94f74e2e113a15
Pushlog: https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=66e7178c31542d5cc6f893c3998ad17bf6845075&tochange=586d65b40b24824331a16be1fe94f74e2e113a15

Comment 3

[Justin Dolske [:Dolske]]

Are you still seeing this?

Flags since set on this bug seem to imply this _only_ affected Firefox 54 (not ESR, and not 55+). If that's actually the case, we can close the bug.


(In reply to Stefan [:StefanG_QA] from comment #1)
> I've used mozregression to find a regression range. Here are my findings: 
> 
> Last good revision: 66e7178c31542d5cc6f893c3998ad17bf6845075
> First bad revision: 586d65b40b24824331a16be1fe94f74e2e113a15
> Pushlog:
> https://hg.mozilla.org/integration/mozilla-inbound/
> pushloghtml?fromchange=66e7178c31542d5cc6f893c3998ad17bf6845075&tochange=586d
> 65b40b24824331a16be1fe94f74e2e113a15

I'm not sure I believe that range. Bug 1325090 seems exceedingly unlikely to have caused this behavior, it's just removing some telemetry probes.

Comment 4

[ertl.maxi]

I don't see the issue anymore, at least on my main PC where I was previously able to reproduce the issue (and I can't test it on another machine right now). I'd say it's safe to close the bug if nobody else is still experiencing it on Firefox 55.