Not @op, but my thoughts on the matter (for what it's worth, I also use Firefox):
Pocket. Just try disabling it. Good luck getting it all.
Then there's the advertisements displayed on the default home page.
Firefox account and Sync. Non-starter for me. I have zero interest in storing credentials in my browser (eg, passwords, autofill, etc) and even less interest in storing anything browser-related outside of my machine; I have no interest in synchronizing tabs across devices using the browser's own functionality.
Then there's the bits about recommending extensions or features as you browse.