516223 - Tabs suddenly open a new window

Status: RESOLVED DUPLICATE of bug 489729

(Firefox :: Tabbed Browser, defect)

Description

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User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3 (.NET CLR 3.5.30729)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3 (.NET CLR 3.5.30729)

While surfing (especially with a slow connection, but also with a faster one) clicking to different tabs will without apparent provocation suddenly cause the tab to re-open itself in a new window (often causing content to reload as well)

It's particularily frustrating for example, when trying to watch streamed content (i.e., Youtube) as the video will start loading again from the beginning, not from what is already in the cache.

Difficult to reproduce intentionally; has been happening since I upgraded to 3.5

Reproducible: Sometimes

Steps to Reproduce:
1.wait for pages to load
2.While page is loading, click on another tab
3.click on yet a different tab
Actual Results:  
for no reason, the tab suddenly opens up in a new window

Expected Results:  
It should simply switch to the tab I clicked on

haven't tested any other conditions, only using default themes etc. Nothing else has been changed added or altered.