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There's a nice extension for firefox called sixindicator which displays a 6 or a 4 in the address bar depending on which one the site uses.

• usr1106 2y ago
  I used that when IPv6 was new for me. It looks nice. Many Web pages contact several servers (even with ad blocking) So not sure a single icon can be more than entertaining.
  • roygbiv2 2y ago
    Agree it's nothing more than nice to see ipv6 is actually working.