firefox problem

[Amadeus W.M.]

After a bunch of updates yesterday I begun to get a message upon starting 
firefox, something like:

ASSERT: *** Search: _installLocation: engine has no file! Stack Trace: ... 
etc.


I click ok and it works, but why do I get that message. I have firefox set 
up to start with google. That site works even with this warning, but some 
sites that I was perfectly able to access yesterday I can no longer access 
today. 

Is anyone seeing this or has any idea what the problem might be?

Oh, I noticed firefox-3.0.2-1 was among the updates of yesterday.