Hello, smart people. Filling out an online form to volunteer for something, Firefox’s Facebook-fence icon appeared on the email field. Confused, I clicked on its question mark. On the next page, Mozilla wanted to sell me Firefox relay for $7/mo. (That’s their VPN + email masking + phone masking.) I used my yandex.ru email address instead for $0. Here’s the question: is Facebook really able to track me because I’ve signed up to volunteer for Cornel West (setting aside the FB-Russia blockage issue)? Thanks.
Some browsers have proprietary APIs that break web standards (see Chrome), and sometimes, workarounds are needed for some browsers. Changing the user agent might break functionality.