Is it possible to use user-overrides.js to prevent a pref set in arkenfox’s original user.js from being set at all, keeping the current value, or leaving it unset and thus as the default? As I understand it, it isn’t, because user-overrides.js is simply appended to user.js, so there is no way to remove a line in user.js via user-overrides.js.

I could just look up what the current value is in about:config and override arkenfox’s value with that, but that would not

• respect changes to the default value via an update,
• maintain changes to the value via the Settings across restarts.