Black Apps Script is a Chrome extension that enhances the functionality of the Google Apps Script Monaco Editor. It allows users to choose different themes, hide certain elements, apply styles to the outer panels, use a code map, access various editor options, utilize pre-defined snippets, and analyze code differences through a side-by-side live comparison. Additionally, the extension offers a new editor that utilizes VS Code TextMate grammars for improved syntax tokenization, as well as the ability to search globally with hotkeys. Enjoy a seamless coding experience with Black Apps Script.