It all depends on what you are trying to achieve.
If "you got nothing to hide" it doesn't matter what you use, just use the thing you like, you are getting fucked anyway. They can probably drive a freight train into your ass by now, sideways.
Only to protect against Hollywood based attacks. Any government backed agency can still get you. They fucking closed down the internet just to catch a guy in Norway who was using Tor so if you are going to annoy them you need some serious OPSEC. First of being, do not post here. Every *chan is seriously monitored since retards started posting manifestos and killing people.
That said, Firefox. Only because of plugins that can clean up your internet experience™. Torbrowser is also good if you need to hide that filthy porn habit of yours from various trackers.