We love Firefox for its extensibility, but sometimes we run into an extension or two that dons the "Experimental" label on the Firefox add-ons site. We prefer highlighting extensions once they've been approved by Mozilla—both so we know they've been vetted and so we can save you the effort of registering with Mozilla to install something—so we generally pass them by. When enough of them pile up in our watch list, we highlight them in one big post (see our two pr