Not entirely true - yes, there’s scripts to harvest even more data… but I run NoScript and even without JavaScript, Firefox in incognito mode still broadcasts things like my screen resolution, browser agent, and even that I’m not running JavaScript which itself is an ID marker - only 1.57% of the site’s stored fingerprints are not running JavaScript.
I’m running this on my Android phone - I think the Mac browser agent is tied to Firefox Incognito, but I’m not sure. It’s not a huge help though if only 1 data point is changing.
Edit: Typos