I've seen the same thing with Chrome. If you log into Gmail it automatically link the browser with the corporate account for all Google services. And if you go

I've seen the same thing with Chrome. If you log into Gmail it automatically link the browser with the corporate account for all Google services. And if you go on the settings page (chrome://settings/) it shows "Your Browser is Managed by Your Organization". This allow the manager to automatically install extensions, filter websites... I removed the auto managed browser while being connected and it wasn't an easy task unfortunately.