Firefox 3 and Domino session cookie

I did a search on “Firefox 3” but didn’t find anything regarding this. I have a website on Domino 7.0.2 server and there is an Internet Sites -document in the NAB for this website. On the Domino Web Engine -tab on the Web Site -document there is:

Session Authentication: Single Server

And also “When overriding session authentication, generate session cookie” is set to “Yes”.

Now here is the problem in all it’s simplicity. When using Firefox 3 there is no session cookie at all in the browser. It seems that it just doesn’t get generated at all with Firefox 3. No problems with FF 2 or any IE or Opera. Anyone else noticed this? And more importantly what is the solution?

Any help and also other similar observations appreciated. Thank you!