[OU] Hide user-agent? user.js? and https?

[Hallvord Steen]

> 1) HOW to Hide completely (blank and/or custom fake) the Opera user-agent header?

You can only do this on a site-by-site basis by editing site-specific preferences (press [F12] for a menu and use the bottom option).
If you want to do it for absolutely all sites you need to send your traffic through a proxy that can rewrite headers for you.

> It seems the tweak, if any, is using an USER.JS.

Sorry, it's not available through user js either.