I don't use tabbed browing with Firefox, but it didn't stop it from freezing, as you described, a few days ago. As you noted, no crash error was reported by Firefox, but something did appear in the Windows 7 crash report feature, which can be called up by clicking on the Start Menu and typing View Reliability History in the search box. (The jump should appear at the top of the list.)
Description
The program firefox.exe version 13.0.1.4548 stopped interacting with Windows and was closed. To see if more information about the problem is available, check the problem history in the Action Center control panel.
Process ID: ca4
Start Time: 01cd60870cf9cdfb
Termination Time: 14
Application Path: C:\Program Files (x86)\Mozilla Firefox\firefox.exe
Report Id: ab82c238-cc7b-11e1-8250-e0cb4efc1b05
In my case, I had opened a second browser window and called up this eBay ad -- http://www.ebay.com/itm/1919-Columbia-Grafonola-Gothic-design-gramopho ne-AD-/190398321496. (I was researching a question posted on an antique phonograph forum.)
Apparently, the ad has some Flash Player content, because Firefox lost focus, as it always does whenever a page with Flash content is displayed. When I clicked on the image to make it larger, Firefox froze. I was able to close it out by clicking the "x" in the upper right corner, which prompted a Windows warning message that "Firefox was not responding."
So far, this has only happened once.
In any event, you might want to check your "reliability history" to see if Windows is recording the freezes.
OF
