[throwaway_bad]

I think you can do it without extensions in firefox since they let you configure your own referrer-policy: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Re... (search for "about:config")

But even in my own APIs I check for referrers to make sure they are actually coming from my site so I assume this will break some pages.

[creatonez]

See also - Smart Referer[1] firefox extension. Only blocks cross-domain referer leak, and has a built-in whitelist to prevent breakage.

^1: https://addons.mozilla.org/en-US/firefox/addon/smart-referer...