Add permission for AudioContext / getClientRects / Canvas / WebRTC

[trackerct]

https://webbrowsertools.com/audiocontext-fingerprint/
https://browserleaks.com/rects
https://browserleaks.com/webrtc
https://browserleaks.com/canvas

https://browserleaks.com/fonts
Font Metrics Fingerprint
Unicode Glyphs Fingerprint

Screen Resolution
TimeZone
https://browserleaks.com/javascript

Why?
http://jcarlosnorte.com/security/2016/03/06/advanced-tor-browser-fingerprinting.html