****....is there anything else that has to be downloaded..????..(just started using firefox a few weeks ago)....does firefox automatically load the anonymizer in the initial download and the button allows it to operate?**** You must download Tor and Torbutton for Torbutton to work.
This link explains it for you By the way, here is a good tip. Always download Firefox add-ons from the add-on developers website. They will have the latest bug fixes which sometimes take a long time to make it to the Mozilla add-on page.