How to view-source of a Chrome extension The article explains two methods to view the source code of a Chrome extension. The first method involves using a command-line tool to download and unzip the extension's CRX file directly from Google's update server. The second method describes locating the extension's installed files in the user's local Chrome profile directory under the `Extensions/` subfolder. extension id=jifpbeccnghkjeaalbbjmodiffmgedin change this ID curl -L -o "$extension id.zip" "https://clients2.google.com/service/update2/crx?response=redirect&os=mac&arch=x86-64&nacl arch=x86-64&prod=chromecrx&prodchannel=stable&prodversion=44.0.2403.130&x=id%3D$extension id%26uc" unzip -d "$extension id-source" "$extension id.zip" Thx to crxviewer for the magic download URL. The Chrome extension source viewer is open source github repo and makes this super easy. - Find your Chrome local profile directory. Open chrome://version/ and find the "Profile Path: field. Open that folder up. - Open the Extensions/ subfolder - All your extensions are here, with typically readable source. - On about:extensions , turn on Developer Mode and you'll see IDs under each entry - Inside the Extensions/ folders, the manifest.json has a readablename field