I have been a moneycontrol.com user for a long time. I read the reports out there and use the portfolio tracker on their site to track my investments. Recently, they changed the UI of the site and brought in a bunch of ads all over their site. Unfortunately, this does not work correctly with FF, and I have the ad appearing right over my portfolio. Annoying and make the site useless.
Took me about 10 minutes to figure out how to use a simple greasemonkey script to remove the ad. Here you go. Enjoy! Power to Greasemonkey, Firefox and the OSS.