Either fully removes navigator.getBattery() or replaces it with a fixed 100%-charged state, to prevent fingerprinting/tracking via battery level and charging status
Userscript neutralizes the Battery Status API, which sites can use to read your device's exact charge level and charging state as surprisingly effective way to track and correlate sessions.
It either removes navigator.getBattery() entirely (block mode, making it look like the API was never implemented, same as Firefox/Safari) or returns a fixed 100%-charged, plugged-in state that never changes (fixed mode).
You can test it's working at https://browserleaks.com/javascript
