Browser Vulnerability Test

This is worrying, especially as we had got used to thinking that firefox wasn't likely to be vulnerable to stuff like this. If you want to test your browser, check this out. If you don't want to worry just ignore this. The advice is "Do not browse untrusted sites while browsing trusted sites."
I think that means if you're online banking or buying something online, make sure that you only have one tab or one browser window open at a time for the duration of your secure transaction. Or it may not be secure after all.
Secunia - Multiple Browsers Window Injection Vulnerability Test