The wonderful TimesFile feature of nytimes.com was pulled last month, and it was revealed that, under the hood, the actual engine was a service called furl.net, Furl being an acronym for file uniform resource locators.
So what is it? With a mouseclick, furl allows you to tag and archive anything of interest you come across on the web. To get started, set up an account at http://www.furl.net and then follow the instructions on how to place the Furl It! javascript bookmarklet button in your firefox toolbar. You might want to rename it something shorter, eg F.