Whenever I open firefox, i get a pop-up window saying "We know you just want the toolbar..." then it ask me to click for toolbar options such as "disable page rank." It's a big ugly grey box.
so i click, don't enable page rank and something else;
then it opens 4 tabs in my window, "thanks for installing ...items." 
finally, a smaller grey box asking me to
keep yahoo as my main browser comes up and i always click "no" as it was never my main browser. then it says, click
don't ask me again, AND I CLICK don't ask me again.
BUT IT ALWAYS ASK ME AGAIN, EVERYTIME I START FIREFOX. It just randomly started while using the internet a couple of weeks ago. I uploaded beta 4 thinking a different version would solve the problem but it didn't. previously I was using 3.1.