closeTabByJS is a free Chrome extension developed by 北京数可视科技有限公司. It falls under the category of Browsers and is specifically classified as an Add-ons & Tools subcategory. This extension allows JavaScript to close Chrome tabs, which is not possible in recent versions of Chrome due to security concerns. However, with closeTabByJS installed, users can close tabs using JavaScript.

It is important to note that this extension only works on http(s)://localhost or, primarily for showcasing local demos. To close a tab using JavaScript, simply run the `closeWindow()` function provided in the extension. This function triggers a custom event called 'closeTabMessage', leading to the closure of the Chrome tab.