Previous versions of MetaMask can be found here.
- Check "Developer mode".
- Alternatively, use the URL
chrome://extensions/in your address bar
- At the top, click
Load Unpacked Extension.
- Navigate to your custom or previous version
- Change to your locale via
- Restart the browser and test the plugin in your locale
You now have the plugin, and can click 'inspect views: background plugin' to view its dev console.