So I've upgraded to Ff 2.0 when it came out - I was previously using the latest of the 1.5.x series.
I use Firefox daily to track bugs - follow builds - write documentation and follow what's going on in the Mozilla world, the rest of the world and the wii. I'm not to much of the type of person who takes hours to configure it's work environment - changing shell, then changing window managers and configuring tools. I use the tools as they come on the system - I adapt to the tools - I do configure some of those, but I usually don't waste hours configuring those. Since Firefox is the tool I use the most on my machine I did some configuration on it, I added some extensions:
This setting use to work fine under the 1.5.x series. But under 2.0 it does not work anymore - When I launch Chatzilla I get some hard freezes - Chatzilla because white and does not take any text input - the rest of the browser does not responds - so I need to kill
it. I'm the only one in the company having these issues - Some did have it but they where gone after a reinstall - this was not the case for me.The problem is not related to either the technorati search nor French dictionary because both of those where installed later. I wanted to file a bug, but I needed more than the above description to make a valid bug report. Hence I decided to open the Error console and try to catch some errors that might be triggered when I was having this problem. Now is the fun part, when the error console is open I do not get those freezes anymore ....
Apart from that big issue, I'm very pleased with some of the stuff introduced in Firefox 2.0. I've seen many people wondering about what where the new features that would make them upgrade. For me the killer feature added in 2.0 is inline spell checking - it does not catch everything, because I really am a bad writer, but it catches my common dyslexia issues where I tend to mix letters in the wrong order, catches French/English spelling issues where I write the word the French way in English and vice versa. I like the way tabs are being handled : a lot more like in Camino and I really love the fact that tabs can be moved - but I'm not so sure that this is a new feature. Second feature I've love to use is the restore session one - when I need to reboot - because of a software update, or because of the aforementioned freeze - when I start Firefox up again, all tabs are open the way they where before - very very useful. I have Firefox open 24/24 almost seven days a week and it rarely crashes nor is it using more than 400 Mb (Which is a lot, but I have many tabs open). If you where wondering why to update, you should not anymore and you should update now.
 I don't really like Chatzilla, but It is able to authenticate using certs and my favorite irc client X-chat did not. But thanks to Wolfgang it should now work.