Well I've spent a lot of time browsing on the web. I was one of the first to use Adblock plus when it came out. Ghostery is a non invasive low cpu using miracle. I've been using this service and it is without fail the best thing you can have as a addon for your firefox. If you like privacy and no ads this is a must have
EXTREMELY FRUSTRATING APP!!! It will not save your settings on a particular site and is constantly blocking items that have been whitelisted. I've gone in and reset the approvals and on reloading the page, ghostery reverts to it's original settings and I'm right back where I've started. I just shut it off completely.