- After installing any of the above given extension now proceed for further instructions.
- Login Your Facebook of which you want to delete all messages.
- Now visit to Inbox portion and you will see all the all the messages from recent and previous conversation of all friends is visible.
- Now click on the icon which will visible at top side of URL bar. It will only appears on Facebook after installing above given extensions.
- When you click the icon it prompt the alert message for you to confirm that you want to delete all Facebook messages or not.
- After that click on Load Older Threads button to delete conversion for the rest of friends.
- It will hardly take 10-20 sec to complete all task of deletion.
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Note: Please note that this tutorial is solely for educational purpose and I am not responsible for any kind of illegal usage of this tutorial.