NCBO REST services recently added a required API Key that must be used when accessing NCBO REST endpoints. In order to avoid annoying and repeated copy and pasting, we've created a Firefox extension that will store your API Key and automatically append it to the URL when you visit NCBO REST services in your browser. If there is already an API Key in the URL then nothing happens and the URL remains unchanged, allowing you to test with a specific API Key without changing your preferences.