So I know it's already been discussed but I just wanted to say that Zoho Creator and Zoho CRM work horribly in Firefox 3.5.2
As a Web Developer wanting to play around with the new features of 3.5.2, it was getting very annoying not being able to use the newest version. IT'S NOT LIKE I COULD JUST USE SAFARI OR CHROME FOR ZOHO CREATOR EITHER!
So now I'm running 3.013 (downloadable on firefox.com) AND 3.5.2.
Here's a great little tutorial on how to run multiple versions of Firefox.
http://www.command-tab.com/2008/06/18/how-to-run-firefox-2-and-3-simultaneously/