'Rickroll' protection hits Firefox in add-on form

Are you the victim of frequent Rickrolls? The time-honored, and now passe trend of being tricked into thinking you were seeing one video and ending up seeing a rendition of Rick Astley's "Never Gonna Give You Up" instead?

Install it, and it will do a quick check on the page, as it's loading, to spot Astley's video and keep it from playing.