I've been using the new firefox since the beta was released for both Widows Xp and Ubuntu 8.04. I will agree that the beta versions had many bugs mainly in my Ubuntu install. Since upgrading to the release candidates i haven't had any problems for either operating system. I highly recommend anyone to upgrade with the memory leak fixed and many features added it is a must have. Here is a link to every thing that has been added to firefox 3. http://www.dria.org/wordpress/archives/2008/06/12/655/