It used to be my browser of choice, but it has become unstable, maybe due to the plugins, flash, etc. but there are times I've shut firefox down due to memory usage (up to 2 gb or more) and it won't release the memory and it still show as an active app, even though it was shutdown. Sorry, but I no longer recommend firefox.
Mozilla Firefox (known simply as Firefox) is a free and open-source web browser developed for Windows, OS X, and Linux, with a mobile version for Android, by the Mozilla Foundation and its subsidiary, the Mozilla Corporation. Firefox uses the Gecko layout engine to render web pages, which implements current and anticipated web standards.
I do prefer this one over others, the only real bad thing it's that every time I set it to my language, the browser resets to english, but it's just this, really.