Extension.js features overview

    Understand the core platform capabilities that make Extension.js practical for real-world browser extension development.

    Feature chooser

    GoalStart here
    Ship one codebase to multiple browsersCross-browser compatibility
    Handle browser-specific manifest differencesBrowser-specific manifest fields
    Keep non-manifest assets organizedSpecial folders
    Manage environment-specific behaviorEnvironment variables
    Centralize build/runtime defaultsExtension configuration
    Extend bundler behavior safelyRspack configuration
    Understand update behavior in dev modePage reload and HMR
    Avoid path drift between source and outputPath resolution
    Build and package for target matricesMulti-platform builds
    Review the telemetry privacy contractTelemetry and privacy
    1. Validate browser output guarantees (cross-browser-compatibility).
    2. Lock project defaults (extension-configuration).
    3. Add advanced behavior (rspack-configuration, environment-variables).
    4. Optimize release flows (multi-platform-builds).

    Video walkthrough

    Next steps