I'd like to know this as well. It's so bad on IE9 I had to give up and switch to google chrome (what a difference). That still doesn't explain why though, AB used to bu$$er up all my other tabs too.
Thanks for all your replies. I have not tried this topic much before, and am mostly on Puzzles/Crosswords.
I have Chrome and Firefox, but I mainly use Safari/Google. This problem seems fairly frequent as far as I'm concerned. I can't stand the ads, but I'm sure they're necessary to cover costs.