Moz.Qual.Feedback Agent And FF1.5.0.1

FF1.5.0.1 has been bringing up the Quality Feedback Agent, the last three times, on closing. I think that all was well before, and also after using FF1.5.0.1
But, come to think, I was trying to fake out launch.yahoo.com (unsuccessfully) by using another UA. In 1.5.0.1 I go as far as the internal player, and nothing happens. The test screen was only half inch high.
This works well with FF1.0.7.
If no crash after posting this, I got my answer.

 

1.5.0.1 crashed after using only WindowsBBS.
So, I unistalled 1.5.0.1, and reinstalled 1.5. And, I am watching/listening Yahoo Launchcast. I am faking the User Agent to 7.2 . I also have the ActiveX plugin . My guess is that FF1.5.0.1 may not be compatible with the plugin.
UA being used is: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 (No IDN) Netscape/7.2 (ax)
Actually UA is: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8) Gecko/20051111 Firefox/1.5, and it plays switching to default.
I have to log in in Launch, with my Yahoo username, and allow popups for the site.

Score is: Westside 2 - Yahoo 1

Note: FF1.5.0.1 never exceeded a Memory Usage of 50 MB, while 1.5 is going strong at 86MB, and leaking like mad.