GitHub Squash Warning is a free Chrome add-on developed by Andrew Bridge. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. This handy tool aims to provide a warning in GitHub when the "Squash and merge" option is selected in a pull request (PR) that appears to be a deploy PR.

The main purpose of GitHub Squash Warning is to prevent accidental squashing and merging of PRs that are meant for deployment. By detecting PRs that merge a branch named "develop" into a branch named "main," it offers a helpful warning to the user. This feature ensures that developers are aware of the potential impact of squashing and merging, reducing the risk of unintended consequences.

GitHub Squash Warning is currently limited to detecting PRs only. It is a valuable tool for those who want an extra layer of caution when handling PRs that involve deployment. With its straightforward functionality and seamless integration into GitHub, this add-on is a useful addition to any developer's toolkit.