597366 - Sometimes tabs don't close properly and remain as invisible uncloseable tabs

Status: RESOLVED DUPLICATE of bug 585785

(Firefox :: Tabbed Browser, defect)

Description

[Timofei Shatrov]

User-Agent:       Mozilla/5.0 (Windows NT 5.1; rv:2.0b6) Gecko/20100101 Firefox/4.0b6
Build Identifier: Mozilla/5.0 (Windows NT 5.1; rv:2.0b6) Gecko/20100101 Firefox/4.0b6

Sometimes after a tab is closed, it doesn't go away. You can see it in Panorama, and even sometimes open it, but you can't close it. Ctrl-W doesn't make it close. Clicking on X in Panorama view doesn't make it close. It only goes away when you close Firefox. I had Colorful Tabs extension, and it modifies how tabs look, so I could actually see these ghost tabs (they are 1px wide, and normally you can't switch to them). I thought maybe it's a Colorful Tabs bug, but now I'm getting it even after I turned this extension off.

I haven't figured out a condition under which such tabs appear, but they always do after I use Firefox for a prolonged period of time. I don't use more than one Panorama group, but I do have 3 App Tabs, which might or might not have to do something with it.

Reproducible: Sometimes

Steps to Reproduce:
1. Use Firefox normally. Open a bunch of tabs, close them, do all the tab stuff that a normal user would do (I'm pretty sure I don't do anything crazy with the tabs)
2. After some time, close most of the tabs so that their number is manageable.
3. Open Panorama (Tab Candy) and see if there are any extra tabs, unaccounted for.
4. Try to close these extra tabs, which is impossible. Try to switch to them, which may be possible, or may be not.
Actual Results:  
One or several extra tabs may appear that are impossible to get rid of by natural means.

Expected Results:  
There should be no tabs that are not visible in normal UI.

Comment 1

[Christian Ascheberg]

probably duplicate of bug 585785

Comment 2

[Matthieu Chaton]

Attachment: ghost tab is not in the tabs list

ghost tab is not in the tabs list
The width is 1px

Comment 3

[Matthieu Chaton]

It is not a duplicate of bug 585785.
The ghost tab has a width of 1px, but is not referenced in the list of tabs opened. It can be hovered with the mouse, there is a thumbnail shown, but if the ghost tab is dragged outside of the tabs bar, a new window is opened, but with an empty tab.

I have included a few snapshots to show the problem.

Comment 4

[Matthieu Chaton]

Attachment: ghost tab being moved

Comment 5

[Matthieu Chaton]

Attachment: ghost tab can be pinned

By hovering the mouse on the ghost tab, it's possible to pin it.
But there is no way to select, display or delete it

Comment 6

[Matthieu Chaton]

Attachment: unpinned tab appears normally, but unselectable, and not in the tabs list

Comment 7

[Dão Gottwald [:dao]]

(In reply to comment #3)
> It is not a duplicate of bug 585785.
> The ghost tab has a width of 1px, but is not referenced in the list of tabs
> opened. It can be hovered with the mouse, there is a thumbnail shown, but if
> the ghost tab is dragged outside of the tabs bar, a new window is opened, but
> with an empty tab.

Bug 585785 doesn't seem to contradict this.

Comment 8

[Matthieu Chaton]

You mark this bug as a duplicate on the base of only one similitude.
The problem is not the width of the tab, the problem is that the tab cannot be removed !
So I still don't think it's a duplicate.

Comment 9

[Dão Gottwald [:dao]]

(In reply to comment #8)
> the problem is that the tab cannot be removed !

This is part of bug 585785 as well.