Up Arrow to Edit Last Message on WhatsApp is a Chrome extension developed by valentincostadev. This free extension falls under the category of Browsers and the subcategory of Add-ons & Tools.

The main functionality of this extension is to allow users to edit their last message on WhatsApp web app by simply pressing the Up Arrow key. This feature comes in handy when you realize you made a mistake in your previous message and want to quickly correct it without the need to delete and retype the entire message.

To use this extension, all you need to do is install it on your Chrome browser and open WhatsApp web. When you want to edit your last message, simply click on the input field where you type your messages and press the Up Arrow key. The extension will automatically fetch your last message and allow you to edit it.

Overall, Up Arrow to Edit Last Message on WhatsApp is a useful extension for those who frequently use WhatsApp web and want the convenience of editing their last message with a simple keystroke.