Another Workaround for Aardvark in FF4 Rated 5 out of 5 stars

If you're careful, you can go into 'about:config' in Firefox 4, searching for 'extensions.checkCompatibility.4.0' and setting it to 'false' to allow you to enable certain "incompatible" extensions. Aardvark DOES work fine in Firefox 4.0. Despite being seemingly-abandoned by the author, Aardvark is still my favorite extension of its type, making it easy to format a page for printing or screen captures.