Firefox - make it default browser. Apply the following settings:
First two shots are of forms and password info options. I do not allow either of these to remember information. You may wish to follow suit.


Downloaded files settings.

Cookies settings - I allow them from the originating server only and force delete on program termination.

I do not allow cache to grow.


Advanced settings tab.

Once you select Block Pop-Ups, you can state which sites may override the block.


Similarly, you can indicate exactly which options to allow for javascripting.
