Rated 4 out of 5 stars

I found a strange thing: if you open second window of FF15, the extension is working properly! But in original window it doesnt work :(

This review is for a previous version of the add-on (0.9.9.7.1-signed). 

Wow Thanks!

Then I think it's related to some object loading issue
Thank you very much for this info! (I mean it :)