Additionally, if you see the source code, you can see that there is no tracking information sent to the API - only the keyword.
There is also no way to send requests to the Google API to get keyword data.
The API url used is right there in the chrome JavaScript code, as mentioned by someone else on this thread. Very easy to write a simple script to send random words to the API.
It would be extremely helpful to have even a basic tutorial page/link pop up after installation (you can add this hook in the manifest.json).
There is no setup to be done. Once the extension is enabled, you simply visit any supported website and the keyword metrics will show up automatically. Just google for a keyword and the keyword data should be seen under the search box. Visit Google Search Console or Analytics, and keyword columns automatically appear inside the table.
If you are having any issues with this, please do email me at support@keywordkeg.com and I'll be happy to figure out why its not working for you.