Upon updating my Firefox, I have to say that I've never been so disappointed in Mozilla in my 10+ years of use. The new 4.0.1 version is currently at such low functionality that I've switched back to Safari until either 1) current bugs are fixed, 2) a new version comes out, 3) I can revert back to prior version. Issues I have include some superficial issues such as: - Unhappy with new tab placement (prefer below address bar) - Unhappy with new refresh button placement - Tabs rarely save upon closing FF as they have in previous versions - On my Mac, can usually use touch pad to zoom in and out of pages, which is helpful with small text or when I'm trying to view many pictures at once in thumbnail form. This no longer works with the new version. However, the problems that have forced my switch over have been on a more serious level: - Noticeably slower loading pages - Refresh seems to 'time out' as does clicking links sometimes, so that clicking a link or refreshing a page must be done two or three times before it will actually load And the largest problem: - FF now locks up my Mac very frequently so that I have to 'force quit' it. When I say 'very frequently' I mean that it's not uncommon for me to have to force quit two to four times in a period of an hour. When I pull FF back up and it's at the page to restore tabs, I now just create a new session. If I try to restore tabs, it tends to lock up again immediately. Information to revert to previous version appreciated. However, I've seen some complaints that doing so may erase bookmarks, &etc which I would really rather avoid.