Once installed, the extension is activated automatically. Now to delete your Facebook messages with only one click without having to open the individual conversation pages open your Facebook Message page. You will see two extra buttons, one at the top bar and another highlighted in red. Click these buttons to permanently delete your messages and conversations.
Instantly Delete All Your Facebook Messages Once
You can delete all your facebook messages at once by just a simple click. To take control of your Facebook messages, go to the Facebook Fast Delete Messages extension page with your Chrome browser and click the Add to Chrome button to install.
Facebook Comments Box