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I like the idea, what are the chrome permissions like? Is the code open-source so I can analyze?

Sure, you can find the repo in the site, here it is: https://github.com/vilvadot/money-is-time/

Only explicitily asks for storage access to set a flag when the extension is enabled and to save the hourly rate.

It does have access to execute the code on amazon too, which basically is reading info from html and inject another html node.