The add-on still has functionality / faster iteration that isn't quite baked into the release version.
If you want to be more aggressive, you can also toggle the configs privacy.resistFingerprinting and privacy.trackingprotection.enabled which will probably break some websites.
But if the comment above yours is correct, you're defeating a small security measure:
>> It's basic fingerprinting used by every major security-sensitive service, like banks.
>> The more entropy (unique bits of data) about your browser context they can collect, the easier to recognize you and see if you're a human or not (and block if they need to).
https://addons.mozilla.org/en-US/firefox/addon/multi-account...