Firefox has privacy.resistFingerprinting which takes a variety of steps to, well, resist fingerprinting. The functionality was ported from Tor Browser. However, some aspects may be frustrating to the user (set window dimensions, no zoom-level memory, etc.).

There are, of course, many other privacy-related configs in Firefox. Relevant to the Referer header is settings under network.http.referer.* (see https://wiki.mozilla.org/Security/Referrer).