It's super simple to install test versions of the extension.

You don't have to uninstall the real version of the extension you installed from the Chrome Web Store or Firefox Add-on Store, ⚠️ BUT YOU NEED TO DISABLE IT FIRST ⚠️.

⚠️ If you watch an episode with two versions of the extension enabled, whichever version loads it's player faster than the other is shown. The slower version will skip loading the player because there already is one loaded.

Either the real version or the test version can win this race, it's a coin flip. Disable one so you know you're seeing the player you want to see.

1. Download the chrome-prod.zip file
2. Go to chrome://extensions in your browser
3. Disable the real version by toggling the switch off under the extension name
4. Turn developer mode on by toggling the switch on in the top right corner
5. Drag and drop the zip file into the window
6. Done!

On Chrome, the installed test versions remain installed until you remove them.

1. Download the firefox-prod.zip file
2. Go to about:addons in your browser, and click on extensions
3. Disable the real version by toggling the switch off to the right of the extension name
4. Go to about:debugging#/runtime/this-firefox in your browser
5. Click "Load Temporary Add-on" and select the downloaded firefox-prod.zip file
6. Done!

On Firefox, installed test versions only remain installed until you close out of Firefox. Then you have to re-enable the real version of the extension next time you open Firefox