I absolutely adore this concept, but in good faith I can not recommend this application. To the best of my knowledge this extension has write access to the entirety of your canvas if you give it your token (meaning it can submit assignments and do anything that you could do in your own canvas account), and I've looked and there is no way to configure an API token to be read only. I'm sure the dev has only good intentions, but without a way to be 100% sure, and the extreme ramifications if this turns out to be some form of a phishing hack attempt I would stay far away from this. If the dev finds out a way to produce a version of this that doesn't have write access however, I would be entirely for it.