LGTM - Approve! is a Chrome extension that streamlines the process of approving merge requests. Developed by Gerald Nguyen, this free extension falls under the category of Browsers and subcategory of Add-ons & Tools.

The main purpose of LGTM - Approve! is to automatically add a comment while approving merge requests. By doing so, it enhances collaboration between the reviewer and the submitter of the request. The default comment added is "LGTM" (Look Good to Me), but it can be customized according to the user's preference.

It is important to note that the extension does not keep track of the pull request's status if a user has already approved it. If the user later revokes their earlier approval and Gitlab automatically changes the button to "Approve", the extension will not automatically add a new comment to the pull request. In such scenarios, it is recommended for the user to manually add a comment.

Overall, LGTM - Approve! simplifies the process of approving merge requests by providing a default comment and allowing for customization, fostering efficient collaboration among users.