There's a great Safari extension on Mac called SmileAllDay that will automatically redirect you to the Smile version of Amazon.
https://apps.apple.com/us/app/smileallday/id1180442868?mt=12
https://apps.apple.com/us/app/smileallday/id1180442868?mt=12
And Amazon smile! For FF: https://addons.mozilla.org/en-US/firefox/addon/amazon-smile/