Hi forum members,
There are all sort of extensions for FF or Flock, doing all sort of things. What are you looking for in an extension. Get a look here:
http://www.econsultant.com/i-want-firefox-extension/index.html
Clearing all from your browser after a session, then this is the one for you paranoid: https://addons.mozilla.org/firefox/1484/
But remember with the right tools )e.g. Restoration) these data can be retrieved. You really have to wait for mentioned data to be over-written, or you have no defense against some-one with a sleuth-kit. And with Ctrl + Shft + Del you have the same results + a little Crap Cleaner cleansing as a desert.
So think hard, you may not need it.
polonus