you need to disable compatibility for this old extension to work Rated 5 out of 5 stars

https://addons.mozilla.org/en-US/firefox/addon/checkcompatibility/

Rated 5 out of 5 stars

on my windows its working better with x64 Nightly

download this extension from official site Rated 5 out of 5 stars

www.fireuploader.com
v. 0.5 is working well

great Rated 5 out of 5 stars

best for facebook :thumbsup: