I'm on mobile, so it's not going to be as verbose as usual. In no particular order:
Moving away from large corps, breaking up the homogeny of the web, keeping XUL alive, having a browser focused on the end UX rather than the UI and the corp needs, and having add-ons that can actually affect the browser - not the little playground Google thinks will be profitable.
I understand perfectly the need to switch from Chrome, as I've only ever used Firefox. What I meant was to understand the difference between Firefox and this browser (other than the point of breaking up homogeneity, which I agree is a great thing overall)
Pale Moon uses XUL, not WebExtentions, and provides (subjective) a better browser UX. Only major concern for mass adoption is that it doesn't support DRM content.
Moving away from large corps, breaking up the homogeny of the web, keeping XUL alive, having a browser focused on the end UX rather than the UI and the corp needs, and having add-ons that can actually affect the browser - not the little playground Google thinks will be profitable.