NoScript plugin for Firefox

Have you tried out the NoScript plugin for Firefox? It blocks out the scripts from most of the websites (except those in it's whitelist). Blocking out the scripts mean that most of the ads are blocked at the script level itself. Many popups are written using Java scripts. They'll be automatically blocked too.. It's a very good thing that you can selectively block scripts from websites.. But beware. If you are doing a transaction on the web (banks, auction sites, paypal sites, etc) you need to make sure that you have allowed all the scripts originating from that website. If not, the scripts are blocked the first time & the transaction is not complete.. Then clicking on the "Allow" button will reload the page allowing the scripts. This way, the transaction may be carried out twice which may be disastrous..

The NoScript plugin along with the Adblock Plus plugin make sure that you see no ads, popups or run unwanted scripts.