Can not for the sake of it remember a certain plugin that was used on firefox 2.

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I'm wondering if anyone can actually help me, I've had to reformat all my computers in my network due to a systematic error, and upon reformatting the computers, I forgot to write down all the plugins that I had installed on firefox. The plugin I am enquiring about is similar to firefox's WOT addon, but it does not use a rating system, I can only remember the first letter of the name of the plugin which is the letter "D" and how it worked is upon any form of search using any search engine, it would have a red circle or a green circle with a white tick inside. It's been bugging the hell out of me and my partner and I have tried searching all through the firefox addons but well, you most probably know that there is a heck of a load of plugins and addons to go through. Any help on this would be gratefully appreciated.