didnt like Opera at all personally![]()
what's not to like? It's faster than mozilla, lighter than mozilla, and it actually listens to the settings you set up, like "Only open links in new tabs" and it doesn't, unlike mozilla that still opens shit in new windows whenever it feels like it etc![]()

Speed:
Opera quicker to load and run java scripts, Firefox is quicker a browsing (which is kind of the point of a web browser no?). It is not "faster", it is only faster in some aspects
User Interface:
Opera interface is absolutely horrible imo, there is so much crap crammed into the screen anyone would think it was spawned as a side project by Microsoft. It also takes a long time to configure it in comparison to firefox. If you want loads of features out of the box you choose Opera. If all you want is a web browser where you pick only what you want (i fall into this category) you choose firefox, there is no need to tweak its great and clean right out of a install.
Downloading:
They are pretty much the same i didn tlike the Opera open a download tab i prefered the Firefox seperate window method but the UI in opera can be edited to do the same. Both have resume, both are pretty much identical otherwise.
Extendability:
They are the same, Opera comes with more toys packed into it by defalt firefox you simply download what you want and has a larger collection.
Safety:
Bugs in firefox are fixed quicker due to nature of open source, but both are pretty reliable in that respect.
Compatibility:
About the same, but Firefox is more universally implemented, be it because it is popular or because it is open source.
Customisation:
Firefox wins, you can alter the code.. how much more customisable can it get![]()