Opera is another good browser, which runs on a variety of OS, including Windows, Mac OS X, Linux, and FreeBSD.
Opera is available for smartphones, using Symbian, Windows Mobile, Android and Iphone OS, as well as Java ME-enabled devices.
It includes built-in tabbed browsing, ad blocking, fraud protection, a download manager and BitTorrent client, a search bar, and a web feed aggregator. The widgets and add-ons are also useful (like international weather, painting widget, security, google toolbar, google translate widget and others).
It is fast, doesn’t crash often, could easily syncronize your bookmarks from firefox or flock.
If you are using opera on mobile device, you’ve probably noticed how stable the browser is, the capabilities of fast browsing and also how compofrtable the tabs are.