Tor Browser's user agent should be spoofed using "general.useragent.override" in addition to the "resistFingerprinting" settings.

Extensions generally do not respect Tor Browsers "resistFingerprinting" settings but do respect "general.useragent.override". Tor Browser should set "general.useragent.override" to the same value as the "resistFingerprinting" settings. I know that the general advice regarding extensions is "don't", but they are necessary under some circumstances and people are going to use them. By using both settings Tor Browser would benefit everyone by increasing the number of users who look the same. Tor Browser's "resistFingerprinting" settings would still take precedence for all requests not made by an extension.