Originally Posted by
Keithamus
I used Opera for 2 years prior to switching to Firefox, about 6 months ago, so I think I can give a fairly good run down.
Opera is quite a nice package, for ~10mb you get tabbed browsing, gestures, email client, IRC chat, oodles of other features, including a decent and powerful rendering engine. The downsides are, it takes AAAAGES to load up, it feels clunky, it isnt as responsive as the competition, there wasnt (when i was using it) a way to get rid of features you dont want, and so you were actually stuck with say, POP3 mail support, when you dont want it. The biggest downside is that it is closed source, and not free. When I had it, one would have to pay $25 to register, taking the advert banner off, which was a waste of bandwidth and an eyesore.
When I first installed firefox, I was suprised at its loading time, faster than IEs. I started to get pissed off at the lack of features though, then I found out you add xpi's (or extensions to the common man) to add functionality, much like plugins. Within a week FireFox had all the features I liked about opera (gestures, proper tab support and more), and it was a hell of alot faster than Opera. Also being Open source and free, means I dont have to pay a penny for it, and bugs get fixed alot quicker than commercial companies. Opera crashed on a good few pages, which meant I had to use IE instead, firefox on the other hand, doesnt, I only use IE for testing websites I build nowadays. Downsides to firefox? Erm... Java apps slow it right down, some XPIs dont work all that well, but it is just a case of disabling it and finding an alternative.
So incase you couldnt be bothered to rtfp, long story short; out of my experience, I favour Firefox, it can be as good/better than Opera, faster, smaller, more features, prettier. But out of the box, Firefox isnt great, Opera on the other hand isnt half bad, even if it is 3-5x bigger.
P.S I would like to add as a final note, IE based browsers (MyIE, CrazyBrowser, Avant and AOL browser to name a few) are utter shite. They add a small amount of functionality to an already crap browser. This means instead of having a bug ridden browser, you have a bug ridden browser with a popup blocker. The Microsoft Explorer rendering engine has decades to go before it is as good as the next one. Put simply, dont use IE or a derivative.