X-notifer Neo for firefox v2.2.1

Willing to activate multiprocess function in my firefox but i was blocked by
addon x-notifier 3.5.23 ( i'm a heavily user of it) wich is not compatible with multiprocess

I'm trying to install 

This add-on has not been reviewed by Mozilla ... yet ..

and when i try to install it on  FF v48.0.2 (euroballot-1.1)   it says : "addon corrupt"

Any clue to use multiprocess and xnotifier in FF ?