Install a Chrome Extension outside from the Webstore

Emmanuel Gautier / August 13, 2013

2 min read

You may already encounter the case when you see a Chrome extension source code but you don't know how to install it. In this case, you may want to follow the steps below.

If you have the extension .crx file, it means you have the packaged version of the extension. In this case, go to part 1, otherwise, go to part 2.

Install from packaged extension

To install a packaged extension, follow the steps below:

  1. Download the Chrome extension .crx file (if it is already the case, go to part 3).
  2. If you disable the protection settings against Chrome extension installation from outside the Chrome Web Store, the installation should be automatic when opening the file.
  3. Otherwise, open the Chrome extension manager (Menu > Tools > Extensions) and drag and drop the file .crx file.
  4. Si vous avez désactivé la protection contre les installations à partir de site hors du Chrome Web Store, l'installation devrait être automatique lors de l'ouverture du fichier.

Install from source code

To install from source code, follow the steps below:

  1. Download the source code folder
  2. Check that the directory contains a file named manifest.json
  3. Go to the Chrome extension manager (Menu > Tools > Extensions)
  4. Check the ' Developer Mode ' checkbox in the top right corner of your screen.
  5. Three buttons should appear. Click on ' Load unpacked extension... ' and choose the directory containing the source code and the precious manifest.json file.


This tutorial is compatible with Chromium-based browsers (Chrome, Opera, Edge, ...). In case of errors, check if the file manifest.json exists and there are no missing files, like images or JS files.


If you're seeking solutions to a problem or need expert advice, I'm here to help! Don't hesitate to book a call with me for a consulting session. Let's discuss your situation and find the best solution together.

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