How can I use a different user.js to this one?

[useronegit]

How can I use another user.js that can then override certain options?
So if I use both that might override some but if I delete the user.js again that again from Lepton the things are used?

[black7375]

1. Even if you erase user.js, the setting will be maintained.
2. You can just override it.