Then go to add ons (just gooogle firefox add ons) and download:
NoScript (superb and you can block google analytics with it, as well as anything else)
Better Privacy (deletes all those super cookies and flash lso’s that doing a normal delete all and cleaning out ya temp files won’t get rid off, nor will even a dedicated program like cc cleaner etc as good as that is, so it’s essential in my own opinion)
Ad Block Plus (fantastic lil program)

And others that are good but in no means security related are:
Dictionary (your own language of choice of course)

Tab Mix Plus (for some reason, Mozillas addon page does not have compatitble version with the latest firefox :S wierd, but below is a link to the addonn authors page which goes to a dev link which is totally 100% compatible
http://tmp.garyr.net/tab_mix_plus-dev-build.xpi

Colourful tabs (pretty much self explanatory lol)
https://addons.mozilla.org/en-US/firefox/downloads/latest/1368/addon-1368-latest.xpi?src=addondetail

Hope that helps, adios
Super Rat

PS: actually stop using google is another opinion (also entirely mine lol)
I myself now very happily use Bing http://www.bing.com
I find there page fresher and nicer to use, its easier to say lol, and most importantly results are easily on a par if not far better IMO, especially image search IMO (please note we do not need a load of google lovers telling me im wrong, i have gone to the trouble of explaining this in my OWWWWWN opinion, after years of using google and months of happily using Bing.

Be daring, use something different and see for yourself!
Doesn’t have to be Bing that was an example, many others out there…

Also if you use firefox and you want an add on to add Bing as the default search engine in the in built search engine, please go to

https://addons.mozilla.org/en-US/firefox/downloads/latest/10434/addon-10434-latest.xml?src=addondetail

AND BING DOESN’T TRACK YOU LIKE GOOGLE DO – lol yet…
But the point is they don’t at present where as the evil google blatantly do!