system/child_process and spawn() method

[Pavel Romanov]

Hello!

After Firefox update to 51.0.1 this method has been broken(

I opened bug at Bugzilla( https://bugzilla.mozilla.org/show_bug.cgi?id=1336939 ) and there is no any reaction :'(

Do you still fix bugs in Add-on SDK?

My addon has been broken by update from 50.1.0 to 51.0.1 (and any addon that used system/child_process.spawn() )