I have been finding this happens about 50-75% of the time when I post in wordpress blogs I have created:
I will go into write, create a new post, and push "publish". There will be the standard long delay as the post is added, and then all of a sudden firefox goes nuts and starts to open endless numbers of new tabs in my browser window. I have never let it go too long, but I have seen 50-75 tabs without issue.
If I close that browser window but others are open on other things, they too will start popping new tabs like mad when they get focus.
If I manage to get them all closed, a new browser window will pop open and it will attempt to open:
I am not entirely sure what this is about.
Same issue on 1.5 and v2.0.1 - possibly a bug in firefox, I am just trying to figure out what would be calling to that sort of a page.