Firefox 3 beta 2 is now out and available for download and testing . . Available in Mac OS X, Linux, and of course Windows . . . and in many languages. http://www.mozilla.com/en-US/firefox/all-beta.html . . . . and they would be happy to get your feedback should you find something that doesn't work properly or something you just don't like. They even provided a link for you to drag into your bookmark toolbar if you wish. Some add-ons will not work if the developer of that add-on has not updated it to be compatible. http://en-us.www.mozilla.com/en-US/firefox/3.0b2/whatsnew/ Firefox 3 b2 will load in its own folder and not interfere with your primary browser, although I have found it very stable (and fast) to where I have already designated it my primary browser. It even migrates over your Firefox 2 bookmarks and settings. If you first wish to read the release notes and "what's new" . . . http://www.mozilla.com/en-US/firefox/3.0b2/releasenotes/ [yes, I did this post in Firefox 3 beta 2]
Alright, I'm in. I carry a lot of add-ins and the vast majority are not compatible yet. All the same, reading the "What's New" document gives a really good impression of why to upgrade.
Thanks for this information, Patrick, and for helping out with the testing. As a mere user, however, after glancing through the list of known issues, I think I'll wait until they decide it's ready for general release.
A month later the greasemonkey people finally updated their add-on. It's now good through FF3b3 . . . which as of this writing isn't even out yet. I have yet to have a problem with Firefox3 . . . and now my colorful tabs are updated too. P.S. The add-ons will update themselves automatically when new upgrades come out.