Cross browser extensions – lets make one
summary
Shows how a single JavaScript codebase using WebExtensions APIs runs on Firefox, Chrome and Opera with minimal change, and demos concrete features: webRequest API that cancels DuckDuckGo requests, background scripts that fire Notifications, a browser action that opens or pins tabs, a context‑menu word counter built with content scripts and the extension scaffold/web‑ext tools. All examples run live (some flaky on macOS) and the APIs and permissions required are shown.
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