In my opinion Firefox is the best browser.
I started out using IE many years ago, and every time I went to a website I got the message that there were errors on the page. This was so annoying I started using Netscape, it just displayed the page the way it was supposed be, and there were no error messages. Then I moved on to Firefox.
I tried using IE8 and IE9 but they were so slow loading pages, that I just gave up and stuck with Firefox.
I have tried IE10, and I have to admit, it is as fast as Firefox loading pages, but as far as I know it doesn't have the plugins or extensions available in Firefox.
The extensions for Firefox that I use are, Better Privacy, it deletes Flash cookies, Ghostery, it blocks tracking cookies, and NoScript.
NoScript is very easy for the average user. All they have to do is whitelist the websites they trust, like local and national news websites. their bank website, and places they shop online.
NoScript provides protection when you are using Google or Yahoo searches, when you have no idea of what type of website you will be taken to.