595520 - Phantom tab appears in taskbar rollover

Status: RESOLVED DUPLICATE of bug 815237

(Firefox :: General, defect)

Description

[Harry]

User-Agent:       Mozilla/5.0 (Windows NT 6.1; rv:2.0b5) Gecko/20100101 Firefox/4.0b5
Build Identifier: Mozilla/5.0 (Windows NT 6.1; rv:2.0b5) Gecko/20100101 Firefox/4.0b5

(Apologies if this is a duplicate, I had trouble working out the proper names for things.)

I have, on my present Firefox session, got a phantom tab when I rollover the Firefox icon on the taskbar. I can't look at it (probably because it no longer exists), and I can't exit it using the little "x" alongside it. Other tabs are shown fine, and update properly*.

It shows (see URL) a YouTube tab which I exited over an hour ago now, with a plain "page" favicon rather than YouTube's normal favicon.

In terms of reproducibility, I haven't tried restarting Firefox yet. Will do so in a minute.

*Briefly, a few minutes ago, the list only showed the current tab and no others. But that's a separate bug. When normal functionality was restored, the phantom tab was still there.

Reproducible: Didn't try

Comment 1

[Harry]

Restart cleared it; now can't reproduce, alas.

Also, I accidentally set this to file handling when I meant General, apologies.

Comment 2

[Harry]

Still present in beta 6; am going to attach to trunk.

Comment 3

[Harry]

(And when I say "present", I mean with a completely different, much less intensive website. It's definitely a Firefox problem.)

Comment 4

[Harry]

Another thing worth a mention is that in present session (continued from above), they seem to be accumulating. I know have 5 "Phantom tabs" on the go at the same time.

Comment 5

[Wes Kocher (:KWierso) (Not reading bugmail; email directly if needed)]

I'm having this happen as well.

Trying to close those phantom tabs from the taskbar preview logs the following errors to the console: 
Error: win is undefined
Source File: resource://gre/modules/WindowsPreviewPerTab.jsm
Line: 192
Error: browser.webProgress is undefined
Source File: chrome://browser/content/tabbrowser.xml
Line: 1439

Comment 6

[MrX1980]

Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b7) Gecko/20101109 Firefox/4.0b7 build 1

I have sometimes the same problem.
I have now tried to reproduce it without success.
But if I find a way to reproduce it, will report it here.

Comment 7

[MrX1980]

Attachment: screenshot

Comment 8

[alex_mayorga]

Duplicate of 815237 maybe?

Comment 9

[Wayne Mery (:wsmwk)]

(In reply to alex_mayorga from comment #8)
> Duplicate of bug 815237 maybe?

MrX1980, do you agree?

Comment 10

[:Gijs (he/him)]

It's been 7 years, let's assume it is really a dupe. :-)