it's stable, but considerably more annoying about installing plugins and extensions so i'd keep a copy of the old version set up how you like it if you hate the new "features" as much as i do. it's stupid to block mozdev and other obviously legit places from installing xpi's by default and i deeply mistrust anything that wants to update itself. on the other hand, i'm probably pretty far towards the luddite camp and generally try to avoid pictures, let alone things that move around on the screen or anything remotely script/media-content-ish.

btw jrv, what does the web developer do that's useful for regular browsing? i hesistated to install it, i've pretty much got stuff how i like it but it's a pain to change stuff on the fly when you can't do it through the gui.