Check Delete cookies and site data when Firefox is closed.

If you want to stay logged in to particular sites, you can allow exceptions in Cookies and Site Data → Manage Exceptions. ETP protects against many common threats, but it does not block all tracking avenues because it is designed to have minimal to no impact on site usability. This protects you by blocking social media trackers, fingerprinting scripts (note that this does not protect you from all fingerprinting), cryptominers, cross-site tracking cookies, and some other tracking content.

Select Strict Enhanced Tracking Protection.

These options can be found in → Settings → Privacy & Security. When you use Firefox, we recommend changing the following settings to protect your privacy from certain parties, but all browsers other than Tor Browser will be traceable by somebody in some regard or another. Tor Browser is the only way to truly browse the internet anonymously. The token is not included in releases from the Mozilla FTP. Firefox includes a unique download token in downloads from Mozilla's website and uses telemetry in Firefox to send the token.

Ublock origin mobile firefox