Why doesn't my 'platform' work? Rated 1 out of 5 stars

It says, "Not available for your platform."
Why? It doesn't say why.
I'm running Windows 7, 64 bit.
FF 19.0
Why doesn't it work?

This review is for a previous version of the add-on ( 

Sorry, This addon is for "Firefox for Android", but not for Windows or other platforms. I ask for your kind understanding.