Doesn't work. Does nothing on click. The open source code is working, this code was provided as an example by Mozilla, you need to tell your not the dev, if you're not, and a bit more work because you broke the code.

also clicked on popup's buttons also without extension reaction.

Why your WebExtension is not working in FF 47 ?
I clicked on popup's buttons but without extension reaction.
This problem only with version from this site.