DOES NOT WORK Ohodnoceno 1 z 5 hvězdiček

I have tried installing and reinstalling this multiple times over the last couple months, and it fails to work. No matter how many times I restart Firefox and my computer, it still doesn't work. I have this same app on Chrome, and it works fine, but with Firefox is does absolutely nothing.

Not working Ohodnoceno 1 z 5 hvězdiček

As the title says.

Ohodnoceno 3 z 5 hvězdiček

Doesn't seem to work for me in Firefox (although it does in Chrome).

Very good, I would like to have more applications on the labels. Ohodnoceno 4 z 5 hvězdiček

This is very functional, but It would be nice also an add-on to keep the labels for each publication, so that one does not have to rewrite them.