goto addons under tools - hundreds to choose from but noscript should be 1st choice to install then see if any of others might be useful but don't go wild! - you will need to allow many of your sites(eg new igi) under noscript (just click allow 1st time you visit them) but you will be suprised just how many tracker sites are out there - adblock is another useful one if certain banner adverts annoy you.