WebExtensions lacks some essential features but here are the list bugs that will do for me:
- 1381290 - FindProxyForURL() should use object return type and deprecate string format
- 1368559 - Provide contextual info to FindProxyForURL
- 1319630 - FindProxyForURL().type should be able to use new value "system"
- 1319631 - FindProxyForURL().type should be able to return new value "wpad"
- 1319634 - FindProxyForURL().type should be able to return new value "pass"