No matter what the reason is, if you ever want to download and save a Chrome extension as a CRX file, here is how to do it. Generally there are three different ways to download the Chrome extensions. I will show you all three ways; just follow the one that you are most comfortable with. Pack the Extension After Installing If you’ve already installed the extension that you want to download, you can just repack the extension into a CRX file. Before you do anything you need to know the Extension ID of the extension you want to download. Since you’ve already installed the extension, you can get the extension ID directly from the Chrome extensions settings page. To start, click on the menu icon, and select the “Extensions” option from the “More tools” options.