Up until now, Nightly users had to set the value of the preference dom.security.https_only_mode to TRUE to enable the feature in the browser.Mozilla added a new preference to Firefox 80 Nightly that provides users of the browser with options to enable the HTTPS-Only mode in the browser.
While it is arguable that telemetry data isn’t technically “personal data” when it is viewed on its own without other information; however, if there’s a way to link a given set of telemetry data to a particular Firefox browser instance and IP address – and Mozilla just revealed that there is – then that telemetry data all of a sudden becomes the most personal of data.
As promised, our friends at Mozilla landed support for ESNI in Firefox Nightly, so you can now browse Cloudflare websites without leaking the plaintext SNI TLS extension to on-path observers (ISPs, coffee-shop owners, firewalls, …).
We have added a feature to block fingerprinting and cryptomining in Firefox Nightly as an option for users to turn on. In Firefox Nightly 68 and Beta 67, these new protections against fingerprinting and cryptomining are currently disabled by default.