Yes, very good

stopped working (feb-2018)
documentation directs to chrome version

Awesome and THANKS

Love this extension, but just upgraded to Firefox 60.5 ESR and it does not function correctly using this version of Firefox. Will this issue be corrected?

Appears to work just fine with the stable version of Firefox 65.

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. :)