I'm just a bit disenchanted with FireFox, this week. It's a bit slow and jerky in it's latest incarnation. Not terribly noticeably in Windows, but very much so on the several Linux distributions I have running here.
Don't get me wrong, here. I'm not dumping FireFox, but I have been paying attention to and using Opera 8.5 on Windows lately and I'm very happy with it. Yeah, it doesn't have all the nifty extensions and the layout is ever so slightly counter-intuitive. But on Windows, it's a fine browser, since they quit putting ads up in the corner.
Opera on Linux is a bit problematic, depending very much on distribution used and tweaking skills of the user. Not my cup of tea, though I do keep trying it there. Linux has plenty of alternative browsers, so avoiding Opera there is easy.
But right now, for the kind of wholesale surfing I do when perusing all those news sites, Opera is my champion. FireFox will probably get right again with the next version, but for now, I'm avoiding the aggravation; minor as it may be.