Hey,
my first Addon for Firefox does only work with the Developer Edition of FF.
It is available in the Official Addon Database.
If you load it there will be no buttons, but you can modify the settings of my Addon.
Thank you,
i’ve tried it with Nightly 52.0a1 on Ubuntu 16.04 64-Bit and it worked without any problem.
PS: I’ve tried it on the normal Firefox on Windows and Ubuntu