Google Calendar extension
This extension displays data from your Google Calendar without any auth.
Its also allows you to parse working hours from Upwork "Work diary". In order to do this, you need to visit https://www.upwork.com/ab/workdiary/freelancer/#/<you_id>/<yyyymmdd>/mine, switch to list-styled displaying, open the extension (click the extension icon in right top) and click the "Parse" button. Worktime will parsed and added to your calendar automatically. Events will added to the <YOUR_PREFERED_CALENDAR_ID> calendar (you need to set this variable in the constants.js).