Please provide a crash id -> https://developer.mozilla.org/en/How_to_get_a_stacktrace_for_a_bug_report

I do not have a crash ID because Firefox just freezes (hourglass on the window) and then I have to kill the process from Task Manager in Windows 7. No message, no IDs, just freezes. Then Firefox starts with the "Oops this is embarrassing" message, asking which tabs to restore. This happens randomly when accessing sites like Facebook and YouTube and playing videos.

Can I check the log to see if there is a crash ID?

I will try to install the debugging tool and see if I can get any more info. The crash involving Videos/Flash is not the typical crash where you can see the Mozilla Crash Reporter. Its just a plain hourglass freeze-restart.

I can also confirm that the problem occurs more frequently when running Firefox 7.0.1 over a Remote desktop connection.

Same issue here, it says NOT RESPONDING and after 20 seconds came back to life. Hardware acceleration is not active, I`ve noticed that the crash rate is lower now, but still present.

The program firefox.exe version 7.0.1.4288 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: 149c
Start Time: 01cc965e2890f0e6
Termination Time: 20
Application Path: C:\Program Files (x86)\Mozilla Firefox\firefox.exe
Report Id: f2d09708-0253-11e1-ae57-005056c00008

Log Name: Application Source: Application Hang Date: 29.10.2011 20:32:21 Event ID: 1002 Task Category: (101) Level: Error Keywords: Classic User: N/A Computer: I7-eXtreme-PC Description: The program firefox.exe version 7.0.1.4288 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: 149c
Start Time: 01cc965e2890f0e6
Termination Time: 20
Application Path: C:\Program Files (x86)\Mozilla Firefox\firefox.exe
Report Id: f2d09708-0253-11e1-ae57-005056c00008

Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">

 <System>
   <Provider Name="Application Hang" />
   <EventID Qualifiers="0">1002</EventID>
   <Level>2</Level>
   <Task>101</Task>
   <Keywords>0x80000000000000</Keywords>
   <TimeCreated SystemTime="2011-10-29T17:32:21.000000000Z" />
   <EventRecordID>23767</EventRecordID>
   <Channel>Application</Channel>
   <Computer>I7-eXtreme-PC</Computer>
   <Security />
 </System>
 <EventData>
   <Data>firefox.exe</Data>
   <Data>7.0.1.4288</Data>
   <Data>149c</Data>
   <Data>01cc965e2890f0e6</Data>
   <Data>20</Data>
   <Data>C:\Program Files (x86)\Mozilla Firefox\firefox.exe</Data>
   <Data>f2d09708-0253-11e1-ae57-005056c00008</Data>
   <Binary>430072006F00730073002D0074006800720065006100640000000000</Binary>
 </EventData>

</Event>

Please try the steps outlined at http://blog.bonardo.net/2011/09/30/is-your-firefor-freezing-at-regular-intervals