Keep in mind that having an extensively customised setup makes you more fingerprintable - just the fact that some things are not visible to a website makes you unique. Generally, most of the defaults will be best for everybody - especially when it comes to options that are not exposed in the UI (i.e. through about:config).

What could be interesting for you is just running uBlock Origin and have it block all JavaScript by default. That'll block most of the scripts that potentially do tracking (and that Firefox doesn't block natively, e.g. because they also provide functionality), and you can relatively easily enable them on a per-site and per-script basis.