i'm using this extension since 3 years now, and i'm absolutely satisfied !

nie ma innego dodatku. na chrome i na ff. ten jest jedyny!!!!

I'd been using Savard's Checker Plus for years with another browser. I'm glad to see it works just as well on Firefox. :)

This is good!

I extremely like this addon! Excellent!

Me ha encantado,le doy 5 estrellas