EDIT: OAuth article: Comcast/Xfinity, Yandex and perhaps others OAuth doesn't accept localhost ports

[rtanglao]

• Article to edit: OAuth2 for Thunderbird
• Similar bug for Yandex: Bug 2044684: Yandex OAuth doesn't accept localhost ports
• From bugzilla: Bug 2044667: Comcast/Xfinity OAuth doesn't accept localhost ports

While attempting to use the external browser flow for logging into a Comcast email account, we get a plain text page that says error="redirect_uri_mismatch", error_description="Invalid redirect". Deleting the port number from the redirect URI makes this disappear.

We either need Comcast to fix this, a way to fix it ourselves in the provider configuration, or a way to opt out of the external browser flow (currently it's just based on whether the redirect target is the default http://localhost, which it is).

[jtracey]

I don't think this necessarily needs documenting, these providers just use the old in-app browser flow for now.