Since Firefox browser is a product of the open code community, this results in an active programming distribution of firefox extensions. The extensions are plugins that just like skins will add functionality to the firefox browser. The number of extensions is countless and any day more of them are being released. They go from telling the weather or controlling you favorite mp3 player from the browser to adding practical functionality to your special surfing needs, like better managing your downloads or designing web pages.

Slim Extension, could be found at http://v2studio.com/k/moz/ . Click on "Install v0.3" link. If your security settings are at default (I recommend to not change them) then at the top of firefox browsing window, a yellow message will appear. Click on the allow button, and a new dialog will appear with the message that firefox has blocked the unknown site from installing a software. Add the site to the list of your trusted sites and click the "Install v0.3" again. This will pop up a window that will follow you throw the easy and fast installation.