Google™ Hangout Seen Blocker
Seen Blocker allows you to read your messages without notifying your friend about your seen status. Hence, when the extension is enabled your friends wont see the 'Seen' label when you read their messages. To further protect your privacy, seen blocker also blocks a few more reports such as '... is typing' report. The extension can simply be activated from the toolbar button and it will preserve its last activation status across sessions.
1. Disables sending read reports to your friends
2. Allows seen notification from friends
3. Can be easily toggled on and off from the toolbar button
Note: Google™ Hangout Seen Blocker only blocks seen reports on Google hangouts (https://plus.google.com/hangouts) and Gmail interface provided that hangouts has been activated (not the obsolete Google Talk).