Someone brought up the same issue in the comments on that post. Here's the solution given, two options:
1) Login in 'offline mode' then reconnect your cable/wireless connection and go to gmail... This is the preferred method.
2) Download Pocket, and have it find your local offline copy from the drop down of files and login there.
People using two factor authentication, eg with a Yubikey, can not log in, in offline mode. Some people will also have turned this feature off. No idea what Pocket is.
1) Login in 'offline mode' then reconnect your cable/wireless connection and go to gmail... This is the preferred method. 2) Download Pocket, and have it find your local offline copy from the drop down of files and login there.