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browser-extensions-firefox-extension-dev - Develop and maintain Firefox extensions

Build, debug, publish, and maintain Firefox WebExtensions, including Manifest V2/V3, browser APIs, cross-browser compatibility, and Firefox-specific features.

Tags

Updated: 2026-09-29
FirefoxWebExtensionsbrowser extensionsManifest V2Manifest V3AMObrowser APIscross-browser compatibility

Capabilities

Scaffold Firefox extensionsGenerate extension manifestsWrite WebExtension codeDebug extension behavior

Typical Inputs

Extension requirementsManifest versionExtension source files

Typical Outputs

Extension project filesManifest filesStarter code

What this skill does

  • Scaffold Firefox extensions
  • Generate extension manifests
  • Write WebExtension code
  • Debug extension behavior
  • Check extension permissions
  • Support Manifest V2/V3
  • Explain browser API usage
  • Fetch current MDN documentation
  • Prepare AMO publishing
  • Address cross-browser compatibility

Inputs

  • Extension requirements
  • Manifest version
  • Extension source files
  • Manifest file
  • Error messages
  • Target browser details
  • MDN documentation

Outputs

  • Extension project files
  • Manifest files
  • Starter code
  • Debugging guidance
  • Compatibility guidance
  • AMO publishing guidance
  • Packaged extension archive

Requirements

  • Firefox WebExtension environment
  • Access to extension files
  • MDN access when references are insufficient

Source

  • Spec: SKILL.md

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