Firefox 1.0 rawks. There must've been *tons* of debug code in the old version (can't recall if I was running .8 or .9), 'cause 1.0 loads/renders in almost half the time. damn nice..
Also keen, and I'm not sure if the older versions had this, is the live bookmarks. It'll take an RSS feed and make that into a bookmark folder. This combined with del.icio.us gives me *EXACTLY* what I've been wanting in a browser bookmark functionality. del.icio.us stores my bookmarks on a server where I can get them from anywhere, and firefox can grab them and put them on the bookmark toolbar, so I've got a "comics" button that pulls down to a list of my bookmarks labeled 'comics' with del.icio.us, and I can update that folder no matter where I am, so if I'm at a bud's place and s/he shows me a keen comic that I decide I'd like to read, I just add it using his/her browser to my del.icio.us 'comics' group, and firefox here at work will automagically have that link in my bookmark toolbar now! only problem is that del.icio.us can be kinda flaky, so I'm hoping they stableize shortly.
now, if you'll excuse me, I have a 3-month old archive of bookmarks to restore, and a wide selection of RSS feeds to add to my bookmark configuration. :)