Messenger Message Deleter

FB Message cleaner is a free Google Chrome extension that speeds up the process of deleting messages on Facebook. Once add on is installed, it will simply add another button to the far right of your Facebook messages.
Pressing the button will provide the possibility to delete 10, 100 or 1000 messages instantly, no questions asked, unlike the usual Facebook protocol. User Guide: Go in your Facebook message. Click on "FB Message cleaner" icon. Select number of messages you want to delete in a single click. Be careful - message deletion can not be undone.