Hi,

The first mentioned website doesn't load in Edge as well, so it must be an issue on their side (or just a typo in the domain name). Regarding Mint Mobile, what error message do you get?

Here is what I see on the screen:

An error occurred during a connection to af.xdock.co. SSL received a record that exceeded the maximum permissible length.

Error code: SSL_ERROR_RX_RECORD_TOO_LONG

   The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
   Please contact the website owners to inform them of this problem.

For me, that link redirects to https://www.google.com/webhp both in Firefox and Edge. So you're not missing anything anyway :D