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Not working on 64 bit version of Firefox 51, Windows 10
edit: Updated to 51.0.1, it's working now :)

Questa recensione riguarda una versione precedente (1.9.8) del componente aggiuntivo. 

I made tests it the same configuration (i.e. Win10, FF51 64bit) and everything worked. Please make issue report on https://github.com/mkiol/GNotifier/issues or send me more details to gnotifier@mkiol.net. Thanks!