Top UI Kits for Chrome Extensions in 2026: Tested Under MV3 Constraints

A developer tested 10 UI kits for Chrome extensions under Manifest V3, finding that CSS-in-JS libraries like Emotion often break due to CSP rules. shadcn/ui emerged as the top choice because its copy-paste approach avoids runtime style injection. The ranking prioritizes kits that work with Shadow DOM isolation and small popup layouts.