You might not know it, but Firefox was once widely considered to be an innovative browser. It wasn’t just an alternative to Internet Explorer (and now Chrome). Firefox introduced honest-to-goodness new features that people loved and rely on to this day.
They remotely installed a Mr Robot addon (US only), because they thought their user base also liked the show. It was a puzzle/game or something, an unpaid promotion.
Ah yes, I remember now. Man that ticked me off.