You’ve probably noticed firefox’s support for RSS if you’re running a recent version – the little icon at the bottom right of your screen (usually orange, unless you’ve installed a custom skin) indicates the presence of an RSS feed you can bookmark. Livelines extension changes the default behavior so that you can add the subscription to your preferred RSS aggregation tool. It does not (yet) work with every aggregation tool, but if you’re using Bloglines, Newsgator, Rojo, or any of several other tools, this can be very handy – instead of copying and pasting the RSS feed’s address you simply use the tool to automatically invoke the subscription. It also works with any program that recognizes the ‘feed://’ protocol, like my personal favorite Feeddemon. A handy time save if you’re figured out how useful RSS aggregators are. And if you haven’t, you really ought to. It’s all about efficiency.