I am trying to create a r/w google calendar. I get to the logon screen for google, enter my userid and password and get a screen talking about cookies. Enabling the logging shows the following: Timestamp: 22/08/16 18:07:47 Error: [calGoogleSession] Authentication failure: { "error": "cancelled"} Source File: resource://gdata-provider/modules/gdataSession.jsm Line: 267 Timestamp: 22/08/16 18:07:47 Error: [Exception... "cancelled" nsresult: "0x80004005 (NS_ERROR_FAILURE)" location: "JS frame :: resource://gdata-provider/modules/gdataSession.jsm :: calGoogleSession.prototype.login/authFailed< :: line 269" data: no] Source File: chrome://gdata-provider/content/gdata-calendar-creation.js Line: 213