https://www.ghacks.net/2017/02/12/firefox-focus-privacy-scandal/ Emphasis is mine. For more info, including opt-out instructions, click through to: Send anonymous usage data from Firefox on mobile devices https://support.mozilla.org/t5/Prot...ata-from-Firefox-on-mobile-devices/ta-p/37739 Edit: Appears to affect Firefox for Android, Firefox for iOS, Firefox Focus, and Firefox Klar to different degrees. A quick search turns up *.adjust.com endpoints. So that is one domain to look for in captures/logs. Edit2: Thanks for the move moderator. Forgot we had a mobile forum now.