After remote disconnect, ask the user if they want to revert proxy settings.

In any case where the disconnection is not triggered by the getter, make sure the getter is made aware of the disconnect. A tab is opened that asks if they want to revert their proxy settings.

The user-facing text is just my first attempt at communicating what's important, and it should change once we have a better idea of the key info to present on disconnect. 
If not can you add browserConfigs https://github.com/uProxy/uproxy/blob/dev/src/firefox/data/scripts/background.js#L36