> For Firefox, it's 20100101. I don't know why. At some point in time, that date was Firefox's build date. Then, some concerns were raised about that date allo

> For Firefox, it's 20100101. I don't know why. At some point in time, that date was Firefox's build date. Then, some concerns were raised about that date allowing sites to track users based on that date so it was set to 20100101.