Make temporary directory
mv the crx file to the temporary directory
Unzip the crx file
http://www.howtogeek.com/233355/how-to-install-extensions-from-outside-the-chrome-web-store-and-firefox-add-ons-gallery/
To do this, open the Extensions page — click the menu button, point to “More tools”, and select “Extensions”. Click the “Developer mode” checkbox to activate it, and then click the “Load unpacked extension” button. Navigate to the extension’s directory and open it.
Developer Mode Route
1. Download the crx file and unpack the extension using your favorite decompresser. Take note of the directory where you placed it.
2. Open the extension page and activate “Developer Mode”.
3. Click “Load unpacked extension…”
4. Search through your directory tree for the location where you unpacked your extension and click OK. If your extension is called “my extension”, then select the “my extension” directory.
Advantages: You do not have to install anything else.
Disadvantages: Chrome nags you to disable the extension every time you start it up.
