It comes down to preferences in the end. Opera is definitely more secure and less resource hungry then IE, but then again, every browser beats IE on those 2 things, so it's not exactly a big achievement. It also has a couple cool things, like XHTML+Voice (although it's ultimately useless as no other browser supports it, hence no one uses it). But as for its user interface, I'd personally rank Opera dead last (and by that I don't mean behind just Firefox and IE...) Again, that's my own opinion, someone else just might prefer it precisely for it's UI, and there wouldn't be anything wrong with that either. I've been hooked on Firefox since v0.8 (circa 2004), and until anything else comes with extensions that rival Firefox's I have no plans to switch. I'd buy 2GB of RAM extra for it if I had to in order to use it. The features are totally worth it. Hell, I'd even pay for Firefox if it went commercial. It makes using the web and developing/debugging web apps not suck -- finally. It's an absolutely fantastic tool, especially when combined with some extremely useful extensions (e.g. Web Developer toolbar, Firebug, DOM Inspector, FoxyProxy, Tamper Data, Live HTTP Headers, HttpFox, DownThemAll, etc) Besides, it doesn't really have "caching issues". If you don't like the default value, just change it (or disable it altogether). Lower values will make it use less memory if that's your concern, but it'll make it somewhat slower. 2GB of 800MHz DDR2 RAM being ~$30 these days I ain't too worried about it using 200MB (I also currently have VMware, Photoshop, Visual Studio and VirtualDubMod open right now, each of which uses up as much, if not more RAM than Firefox) Edit: also, Adblock Plus is very nice for blocking "ads" for religion-oriented sites in ppl's signatures... Agree everything you say. Extensions I use : Adblcok Plus, Compact Menu, File Title, Flashblock, Greasemonkey, ImgLikeOpera, IETab.