What Is First-Party Isolation and How to Enable It in Firefox
With the release of Firefox 55, Mozilla added a new privacy feature, called First-Party Isolation, that safeguards users from cross-site tracking. Once you turn on FPI, ad trackers can’t trace your web activity or see all the cookies dropped to your system. Here’s how you can enable First-Party Isolation in Firefox.
In short, First-Party Isolation (FPI) restricts access to cookies, the cache, and similar data to domain level only. This means that when you enable FPI, advertising agencies can’t