When we built Copyzoid — a clipboard manager for Chrome — one of the first things we learned is that Chrome extension development has its own rules. The permissions model is strict, the UI is confined to a small popup window, and background scripts behave differently than a typical web environment. We went through three architecture revisions before landing on a structure that felt both performant and maintainable. The biggest early mistake? Trying to sync clipboard data in real time without properly handling the extension lifecycle.
The second lesson was about design in a constrained space. A popup that's 380px wide demands a completely different design instinct than a full webpage. Every pixel matters. We stripped the UI down to its essentials — search, history, templates — and focused on making each interaction feel snappy. Getting approved on the Chrome Web Store also took more care than expected; icon sizing, permission justifications, and privacy policy requirements are all reviewed closely. Ship early, iterate fast, and treat the extension like a real product — because your users will.