Great Rated 5 out of 5 stars
Does exactly what it is advertised to do. I've yet to run into a problem with this add-on across multiple machines.
I'm surprised this isn't more popular as it is incredibly useful. No longer must I run Lynx to check pages I'm already on in Firefox... for what I do this saves a good amount of time and allows me to really see how accessible my sites are to both users and engines.