Just a web browser.
I tried firefox again recently, I really gave it an honest chance, but in the end I just went back to Maxthon.
I can't live without Mouse gestures, Web groups, easy tabbed browsing( I know firefox has tabbed browsing but I find it clucky in comparison)can't beat click and drag links to open them in a new tab, Quick button to turn on and off the pop-up and addblocking wich some safe sites don't like.
Need I say more.
The others I would have mentioned have already been mentioned