Already possible in Chrome, and soon in Firefox, with Edge having announced eventual support; have a look at Fido U2F [1]. Yubico sells U2F tokens that can be

Already possible in Chrome, and soon in Firefox, with Edge having announced eventual support; have a look at Fido U2F [1]. Yubico sells U2F tokens that can be used to authenticate with GMail, Dropbox, and GitHub in your browser; today. I just hope that these standards become implemented soon enough for governments to choose them over home brewed or proprietary solutions. 1: https://fidoalliance.org/specifications/overview/ https://fidoalliance.org/specifications/overview/