675340 - Tab always drags off without holding down mouse button

Status: VERIFIED INVALID

(Firefox :: Tabbed Browser, defect)

Description

[Jeff Muizelaar [:jrmuizel]]

I ran into a situation where a particular tab would always drag off the tab bar even though I wasn't holding down the mouse button. It was just a particular tab and I've only seen it once. It was on OS X.

Comment 1

[Frank Yan (:fryn)]

I can't reproduce this.

Comment 2

[Siddhartha Dugar [:sdrocking]]

Maybe related to bug 674487

Comment 3

[:Margaret Leibovic]

This happened to me before when Frank's patch was in an earlier stage on the UX branch, but I haven't seen it in a while. I'll post in here if I see it happen again, hopefully with a way to reproduce.

(In reply to comment #2)
> Maybe related to bug 674487

That looks to be Windows-specific, and Jeff and I are both on OS X.

Comment 4

[Jeff Muizelaar [:jrmuizel]]

This has happened to me 3 more times. I still have no idea what causes it, but here's some more information. It seems to happen when switching from a tab.

E.g. if we have tabs A, B, C, D and * indicates the active tab and ^ is the tab that causes the stickiness

1. A  B  C^  D*
2. A  B  C^* D
3. A  B* C^  D

after switching to B, it now thinks I'm dragging B. If I drag B to the following configuration and click to release it:

4. B* A  C^  D
5. B  A  C^* D
6. B  A* C^  D

Now it will think I'm dragging A.

7. B  A* C^  D
8. B* A  C^  D
9. B  A* C^  D

In this situation it will not think I'm dragging A, it only seems to happen when I come from C and it only happens when I switch from C to tab immediately to the left or right of C.

Comment 5

[Jeff Muizelaar [:jrmuizel]]

Happened again and again, when switching from a particular tab, it causes the tab switched to, to become draggy.

Comment 6

[Jeff Muizelaar [:jrmuizel]]

Happened again.

Comment 7

[Jeff Muizelaar [:jrmuizel]]

It seems like it's triggered from particular sites, perhaps having to do with Flash.
This site may have been related: http://semiaccurate.com

Comment 8

[(no longer active)]

Anything I can help with here?

Comment 9

[Frank Yan (:fryn)]

(In reply to Ehsan Akhgari [:ehsan] from comment #8)
> Anything I can help with here?

Yes. Reliable steps to reproduce would be helpful.
I've hit this too, but I haven't been able to reproduce it reliably either nor with the steps in comment 4.

Fixing bug 674925 would also fix this, but I don't know if we would be willing to approve such a large patch for beta in order to get it in Firefox 8.

Comment 10

[(no longer active)]

Sorry, I've never reproduced this personally.

Comment 11

[Ioana (away)]

Verified as WFM on:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:9.0a1) Gecko/20110925 Firefox/9.0a1

This issue didn't reproduce although I loaded http://semiaccurate.com/ and multiple websites playing Flash animations in Fx tabs, tried the steps in comment #4 and also some variations on it.

Comment 12

[Frank Yan (:fryn)]

I kinda figured this out, so removing qawanted.

Comment 14

[Asa Dotzler [:asa]]

frank, can you say what you think is going on here, what the fix might entail, and when you might have something for us to evaluate for repairing this feature? I'm concerned about shipping with this kind of failure case and we're getting to the very late stages of the release.

Comment 15

[Gabriela [:gaby2300]]

I could reproduce the issue in:
Mozilla/5.0 (Windows NT 6.1; rv:8.0) Gecko/20100101 Firefox/8.0

Comment 16

[Stuart Cook]

OK, I think I have some better repro steps.

1. Open http://www.gomtv.net/2011gslsponsors6/vod/66231 in a tab.
2. Open some other page (e.g. http://example.com ) in some other tab.
3. In the GOM tab, click on the Flash to give it focus, and scroll down so there is no non-Flash content area between the Flash and the browser chrome.
4. Move your cursor from the Flash area directly to chrome, and click on the example.com tab.
5. After a delay, move your mouse around to check whether dragging is in progress.

Hopefully somebody can get this to work.

Comment 17

[Stuart Cook]

For bonus points, hit control-tab immediately after clicking the second tab.

You will end up with that second tab being dragged, but its preview image will be of a different tab, and won't match the page title at the top of the drag-preview window.

Comment 18

[Stuart Cook]

(In reply to Stuart Cook from comment #16)
> 1. Open http://www.gomtv.net/2011gslsponsors6/vod/66231 in a tab.

I've since been able to reproduce this on other Flash sites, including http://www.youtube.com/watch?v=QH2-TGUlwu4 and http://www.adobe.com/products/flashplatformruntimes/gallery/ , so I don't think it's site-specific. The trick is to give Flash focus, and then move your mouse directly from Flash to chrome, without moving over other content on the way.

Comment 19

[Frank Yan (:fryn)]

Bug 455694's patch was backed out.

Comment 20

[Frank Yan (:fryn)]

Bug 455694's patch was backed out.

Comment 21

[Daniel Desira]

I am still having the same issue on Firefox 11 and 12 on Windows 7. Most of the time it happens for Facebook app tab.