Сливали данные о посещаемых страницах, список забаненных:
Web Security
Browser Security
Browser Privacy
Browser Safety
YouTube Download & Adblocker Smarttube
Popup-Blocker
Facebook Bookmark Manager
Facebook Video Downloader
YouTube MP3 Converter & Download
Simply Search
Smarttube - Extreme
Self Destroying Cookies
Popup Blocker Pro
YouTube - Adblock
Auto Destroy Cookies
Amazon Quick Search
YouTube Adblocker
Video Downloader
Google NoTrack
Quick AMZ
Детали: https://www.bleepingcomputer.com/news/security/mozilla-removes-23-firefox-add...