anchor.diff:    ]
   
     # and wants these
  -  ++ lib.optionals isTorBrowserLike [
  +  ++ lib.optionals isTorBrowserLike ([
       "--with-tor-browser-version=${version}"
       "--enable-signmar"
       "--enable-verify-mar"
  
positive.code:   ++ flag gssSupport "negotiateauth"
    ++ lib.optional (!ffmpegSupport) "--disable-gstreamer"
    ++ flag webrtcSupport "webrtc"
    ++ flag geolocationSupport "mozril-geoloc"
    ++ lib.optional googleAPISupport "--with-google-api-keyfile=ga"
    ++ flag crashreporterSupport "crashreporter"
    ++ flag safeBrowsingSupport "safe-browsing"
    ++ lib.optional drmSupport "--enable-eme=widevine"
  
    ++ (if debugBuild then [ "--enable-debug" "--enable-profiling" ]
  
negative.code:     # possibilities on other platforms.
      # Lets save some space instead.
      "--with-system-nspr"
    ] ++ flag geolocationSupport "mozril-geoloc"
      ++ flag safeBrowsingSupport "safe-browsing"
    )
  
    ++ flag alsaSupport "alsa"
    ++ flag pulseaudioSupport "pulseaudio"
  