Terms
In this document we will refer to different kind of time:

• The watched time: the time that a user has really spent watching a video (different of time between to moment the video starts to play and the end (or pause) of this video)
• The opened time: the length of the video itself on YouTube

Data collected
This addon collects various data from the navigation on YouTube:

• The length of an opened video
• The ID of a opened video
• The length of an watched video
• The ID of a watched video
• The date and time of the event

Data kept locally
The data collected won't be saved as is and will first be processed to be aggregated. Only the date of the event will be kept (not the time) and will be associated to the total time of the opened and watched time and the number of videos opened, thus making the application unable to go back to the details of which video has been watched.

Data saved:

• For each day:
• Total watched time
• Total opened time
• Opened count

Data sent to the server
All the data mentioned in the first section is sent to a distant server upon the agreement of the user through a checkbox available in the settings (data collected before the agreement will be kept locally only). Additionally the name of the browser will be sent and a username can be defined to be sent to the server.

Data saved:

• Username
• For each event:
• User of the event
• Video ID
• Event kind (opened/watched)
• Event length (opened/watched time)
• Browser name (Chrome/Firefox)

This is used to display statistics publicly but not in the detail. Only the username entered (or "Anonymous" by default) and sums over different periods (last 24h, last week and total) of the watched time, opened time and video count will be displayed. Also a chart is available and shows the same data day per day.

Identification of the addon
This addon makes itself visible by the fact it injects elements into the DOM of YouTube.