As you're aware, Firefox (which by the way is my Browser of choice) is configurable by means of plug-ins.
I highly recommend NoScript, which enables you to control the execution of scripts (javascript etc) on a site by site basis.
I've already mentioned McAfee Site Advisor which has a plug-in for Firefox.
You could also try AdBlock Plus not strictly security,but by filtering out adds you remove some re-directed links. Try Filterset G with it, this is a pre-written set of adds that are then blocked by ABP, updated automatically.