Harden in this case is just blocking enough types of javascript, which for anything other than Tor's level, is not effective. The more effective the blocking is, the more the sites break down. And using non-Cloudflare DNS is completely irrelevant, you're still going through a site with their A-record pointed to CF. Further, it sounds you're using the same extensions on each fork, which would tie them together.

Is doing different firefox forks better than nothing? Yeah of course. But I wouldn't be grabbing cheerleader pomp-pomps to root for team apathy mozilla