After I installed Firefox 4, I got some sort of message asking if I want yahoo as home page (I think that's the way it went). I accidentally clicked on the wrong thing. I still have the same screen that I always had & wanted come up when I boot up, but now I have, just beneath t he bar with the back/forward buttons and the address bar and google search bar, a full bar across of yahoo stuff. It messes me up because, when I'm in yahoo email, it opens a nuisance window that won't go away. How do I delete the yahoo tool bar invasion and get rid of its invasive, nuisance windows? I don't want any of it on my screen. I've gone to yahoo all along via my bookmarks, and that's all I want. Also don't need the word "yahoo" in my firebox bar (the one that has file-edit-view-history-bookmarks-tools-help). Please put your reply in simple, low-tech terms. Thank you.