There's a very complicated discussion about it that I can't understand on
stackoverflow.com:
https://stackoverflow.com/questions/2166540/how-can-i-fool-a-site-that-looks-at-the-javascript-object-navigator-to-see-tha
There's also a firefox extension called Blend In that claims to handle it,
and gets decent reviews:
https://addons.mozilla.org/en-US/firefox/addon/blend-in/?src=search
There's several firefox add-ons under the generic name "user agent switcher".
In my testing with fingerprint detection website DeviceInfo.me, only the
Blend In add-on was able to truly fool the anti-spoofing techniques available
to websites. Other "user agent switcher" add-ons were unable to truly fool
DeviceInfo.me. Unfortunately, Blend In only gives one option as a user agent
string - Win 10 with Firefox 78 - because the developers think that will
blend you into the crowd the most.
