Pocket is what comes to mind immediately absolutely, but there's a long and growing list of things I have to disable every time I install Firefox including:
- Their entire ad filled start pages / Snippets / Activity Stream / Suggested sites
- Normandy
- safebrowsing
- Push notifications
- Firefox Feature Recommendations
- Firefox Hello
- Firefox Accounts / Sync / Firefox Monitor / CloudServices
- Shield opt-out studies / Test Pilot / Experiments
- pre-installed 3rd party search engines
- PDF reader
- screenshots@mozilla.org.xpi, pictureinpicture@mozilla.org.xpi
- Password generator
Don't get me wrong, I'm a fan. It's still the most customizable browser available and with a lot of work (and a few add-ons) the most secure and private by far, but lean browsers don't require all this to prevent unsolicited network connections : https://support.mozilla.org/en-US/kb/how-stop-firefox-making...