How do I turn all this off if my wife is using it to spy on me?

If you check none of these apply to you: support.mozilla.org/en-US/kb/access-mozilla-services-firefox-account#w_what-services-can-i-use-with-a-mozilla-account — i.e. none of that functionality is necessary, you can just sign out on that device. This is the desktop description: [[Delete sync data from Firefox by signing out of your Mozilla account]] but it works the same on mobile — the documentation for the interface is in [[Sync bookmarks, logins and browsing history on Firefox for iOS]] (you just need to follow it disable the settings analogously). The full description is in: [[How do I choose what information to sync on Firefox?]] [[Sync Firefox data]] (incl. where the device will get removed from the account vs. just kept with no data synchronized etc.)