When i upgraded to FF4, the first thing i noticed was the new look to my home page. then i did a search. that's when i discovered that by upgrading, FF changed some of my default settings. the default search engine is now yahoo! Geez! if i had to reset my default settings just to update/upgrade for all the software that i have on my computer, i would... after reading some other's thoughts, i'd have to say that mozilla firefox released version 4 just a little too soon.