block non-free javascript

currently tor team have working on a fork of noscript #19280 (moved) (or at least I think so). I think is also a nice idea add a option to run just "free javascript" (non opcode and non server side depentendo script)

FSF has a campaign about this, look the loinks inside. https://fsf.org/campaigns/freejs

Trac:
Username: f451022