I think we are doing ok, not great nor fantastic, but ok, most of the overrides/fixes are in this file: https://github.com/Jelmerro/Vieb/blob/master/app/preload/privacy.js
for example:

• cpu and memory are fixed to 8
• keyboard info is blocked
• battery info is blocked
• network info is blocked
• prompt/alert/confirm are mocked so they don't interrupt
• permissions are blocked by default (that is in app/index.js mostly, although the mediadevices are in privacy.js)
• webgl gpu names are blocked

Most of the other stuff like DNT, plugin lists and encoding sets are set to chromium/chrome's default values. The reason these tests are unique is due to canvas and WebGL hashes, which I have yet to find a solution for that runs in the Electron project. As per usual, PRs are welcome.