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I have updated the code with your fix. Thank you for catching that.
The redirect loop unfortunately has to do with Amazon Smile redirecting back to Amazon if the user is not logged in. I have a solution in place for my Chrome extension, but haven't had the time to figure out a solution for the userscript yet.
Latest update has this fix. Thank you1
Good call, I thought I did one of those already. I updated it to use https. Thanks for catching that.