When you install Firefox Preview, tracking protection is enabled by default. This is recently true for Firefox Desktop as well.
https://blog.mozilla.org/blog/2019/06/04/when-it-comes-to-pr...
This post below by our CEO explains how we're thinking about the issue broadly. Your privacy and agency are definitely front and center.
https://blog.mozilla.org/blog/2019/06/04/the-web-the-world-n...
(Disclaimer: I work for Mozilla)
