Greasy Fork

Working pretty well. Except when Google Search decides to not show the tabs.
The Maps link can also be injected into the link list directly below the search field by targeting the div class "crJ18e" instead of "IUOThf", and changing the button div class from "GKS7s" to "YmvwI".

I tested your suggestions and upgraded the code.
Now it also targets the little map shown on the right tab of the search results. :)
Thank you!