well i dont wanna get into some huge debate, but my reasons are:

firefox(especially after 2.0) got bloated and slow as hell, i used to use it just to open a single page because i would have 20-40 tabs on my opera that i didn\'t feel like opening. but then i realized ie opens much faster than firefox.  opera also loads pages(theres been benchmarks) and handles memory(the aformentioned 20-40 tabs) a great deal better than firefox.

i mentioned the plugins, firefox has come a long way with them but when it was just being released basically all their plugins were ripoffs from shit that opera has had built in for many years. aside from the plugins, opera is much more configurable that firefox. theres so many options and preferences for gui and functionality. there used to be a shitload more options in older versions but i guess they felt it was too complex for most users ;(. so i\'ve covered it being slow and not very funtional. the only thing that could possibly be left is its more secure, but i dont get hacked or download dumb shit so thats never been a problem.


P.S. try the plugin out its realy cool =\\