Best add-on for browser for receiving discounts or rewards for shopping online?

There's so many and I am extremely overwhelmed. I shop via Stop & Shop and Amazon every week through my laptop and realized that many places offer discounts for doing so? Advice on which ones are the best?

submitted by /u/datemycat
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source https://www.reddit.com/r/beermoney/comments/10peiam/best_addon_for_browser_for_receiving_discounts_or/