This extension allows you to delete or archive all of your facebook messages in one click.
1- Install Delete facebook messages extension for your chrome browser.
2- Go to https://www.facebook.com/messages.
3- Click on Delete facebook messages extension icon.
4- Click on "Begin Deletion" to delete all your messages.
5- Click on "Archive Messages" to archive all your messages.
Note: Please change your Facebook language to English before performing any operation.
Support: Feel free to contact us if you find any bugs or have any suggestion.