Thank you for the suggestion - that is a lovely idea. I do agree that there are a lot of functionality that is undiscovered by many users. I'm interested to know, where would you expect to find a Firefox Tour? For example, in settings?
Thank you very much for your feedback. We are fixing this issue using the proposed solution here (image below). Feel free to follow this bug to track our progress or stay tuned here for updates on when it will be delivered.