Dev Shares Key Lessons From Building and Launching First Chrome Extension
A developer built and published Promo Drop, a free Chrome extension that surfaces verified promo codes and cashback offers for products on Whop, after noticing how difficult such deals were to find. One major technical lesson was adapting to Manifest V3, which replaces persistent background pages with short-lived service workers, requiring all state to be stored externally rather than held in memory. To protect core business logic, the extension was kept deliberately thin, with code-finding functionality handled server-side so the method cannot be reverse-engineered from the client package. The developer also emphasized requesting minimal permissions and writing clear justifications for each, which helped speed up the Chrome Web Store review process. On the ethical side, affiliate attribution was designed to trigger only on genuine user actions, never silently overwriting existing affiliate links or dropping cookies in the background.
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