It's super useful, but it currently doesn't work in FF 50.0.2 on Windows 10 Rated 4 out of 5 stars
It has worked fine until recently.
I'm using Firefox 50.0.2 on Windows 10 and clicking the Camel icon right next to the address bar returns an empty white panel.
Disabling uBlock and NoScript extensions didn't help.
Still, 4 stars because it deserves them!