Rated 5 out of 5 stars

Good Job !
I made the same kind of extension, but yours is really effective :-)
Just a little bug to report.
When you click in the "downforeveryoneorjustme", you'll be redirected in this : "http://www.downforeveryoneorjustme.com/http:/www.sitedown.com"
It'll be this instead : "http://www.downforeveryoneorjustme.com/http://www.sitedown.com" (look, a slash is missing)
I'm in ff4b8.
Thank you
Xéfir Destiny

This review is for a previous version of the add-on (3.4.4). 

Thanks for reporting this! The bug has been resolved in version 3.4.5.