The function which I love is when I type in address bar, for example - the pirate bay, firefox will open http://thepiratebay.org. Nice!

I am quite happy with Firefox.My only complain is about it's page loading issue.Sometimes I need refreshing to load a page even for the first time.

Still using 3.0, I've been hesitant to upgrade due to all the mixed reviews and security issues.
I've definatley preferred it over IE. Plus it works out great on the home PC. I use Firefox, the wife uses IE. Can't say I've used the brower to its fullest potential in it's current state so I'm not sure if the upgrade is worth if for me but maybe I'll give it a try.

It seems Firefox skins will also become much more interesting than until now - take a look at Operetta and Operetta Advance, for example. Firefox with Opera looks, that's awesome!

Finally , i can once again , i can use the mighty FireFox ! It was starting the get annoying using Opera ;/ . Can't wait for the full version to come out ! Trying it out right now , and works awesome , not perfect but big still improvements !

I like trying the firefox betas but they always seem to crash when i do.

I'll wait for the next final to give the new firefox another try.

I've used 3.5 for quite a while and wasn't happy with it at all. It got slow and unstable when it was open for a longer time and the few additional features were not worth this hassle, so I went back to 3.0.15 and am pretty happy with it.

Eh, it crashed on me one too many times. I have XP 64bit pro.

Am downloading it now

3.5 is a memory hog, I have seen or heard about it from too many people, it can't be 'just my experience'
3.6 beta seems better, somewhat, but mozilla guys are already putting themselves in danger relative to Chrome

All of the addons I use are still working, I imagine a lot don't, but the likes of linky, adblock plus, stumbleupon and flashgot work.

Love the feature that lets you preview tabs using aero peek.

Does beta 1 imply a better 2? Im glad to see there overall support for there browers continues, I can't believe they could make it any faster as it was already the fastest one I use. Lately iv been falling for safari brower, maybe I wont tho if this is the future for firefox. It can only get better.

Firefox is getting a lot better, but I wish they'd hurry up and supported threading like Chrome. I'm tired of having a single tab getting stalled on something and making the entire Firefox process unresponsive.

Once again FF FTW (and not just because I help make it).

IE users need to get with the program!

What older versions did you use?
Here are some pros: better security (much better that IE8); better support for newer versions of html, CSS, etc; better javascript engine; here are some addons: download status bar, downloadthemall!, built in IRC client (don't remember the name now), FireFTP, AdBlock Plus, Noscript, VideoDownload helper, etc (there's something for anyone!) + themes.
Here are some cons: it can use a bit more memory that IE (especially if you have many addons), if you have many addons loading times increase (i only keep 3 or 4 at max just to be sure) - no other cons i can think of right now. FF 3.6 solves most of the loading times problems but i'm waiting for the final release not the beta

The full screen video feature is extremely useful, especially for JTV and other streams Hopefully this will leave beta soon.