At the moment UIO+ allows the browser to cache the preference settings. On macOS these changes persist until the browser is quit. Preference settings are also delivered from a logged in preference set, if running on a morphic enabled machine.
Now that there is a reset option, it would be good to persist the settings by some other, more permanent means. one option to explore would be saving to the user's google account. In this way it would be transportable across machines.