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browser-extension-builder

Expert in building browser extensions that solve real problems - Chrome, Firefox, and cross-browser extensions. Covers extension architecture, manifest v3, content scripts, popup UIs, monetization strategies, and Chrome Web Store publishing. Use when: browser extension, chrome extension, firefox addon, extension, manifest v3.

Author

@sickn33

Category

Development Tools

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Browser Extension Builder - Browser Extension Development Expert

Skill Overview


Help you build browser extensions from scratch that truly solve problems — supporting Chrome, Firefox, and cross-browser development, covering the Manifest V3 architecture, content scripts, popup UI, monetization strategies, and the full Chrome Web Store publishing process.

Applicable Scenarios

  • From-scratch browser extension development

    • When you have an idea you want to turn into a browser extension, this skill can help you design the extension architecture, write Manifest V3 configuration, implement Content Scripts and a Background Service Worker, and ultimately publish to the Chrome Web Store.

  • Manifest V3 migration or upgrade

    • When you need to migrate an old Manifest V2 extension to V3, or want to learn V3’s new features and best practices, this skill provides a complete migration guide and code examples.

  • Extension monetization and store publishing

    • When your extension is ready to go live and you’re considering monetization, this skill helps you design pricing strategies, implement paid features, prepare store assets, and navigate the Chrome Web Store review process.

    Core Features

  • Modern extension architecture design

    • Provide a complete extension project structure template, including manifest.json configuration, Popup UI, Content Scripts, Background Service Worker, and Options page. Teach you how to design internal communication mechanisms, implement message passing between Popup ↔ Background ↔ Content Script, and use the Chrome Storage API to persist user data.

  • Content Script and page interaction

    • Write code that runs on target web pages, including DOM manipulation, UI injection, event listening, and isolating interactions with page scripts. Provide practical code patterns for safely modifying page content, extracting web data, and creating floating UI components.

  • Chrome Web Store publishing and monetization

    • Guide you through the entire store publishing process, including extension icon design, privacy policy drafting, permission descriptions, and responding to the review process. Offer various monetization strategy references such as one-time payment, subscription, in-app purchases/unlocks, enterprise licensing, and how to implement license verification and paywalls.

    Frequently Asked Questions

    How do I develop a Chrome extension from scratch?

    Creating a Chrome extension requires the following basic steps:

  • Create a project folder containing the manifest.json configuration file

  • Declare the permissions and features the extension needs (action, content_scripts, background, etc.)

  • Write the Popup UI (HTML/CSS/JS)

  • Write Content Scripts to handle webpage content

  • Write a Background Service Worker to handle background logic

  • Load the unpacked extension for testing on Chrome’s chrome://extensions page

  • Prepare store assets and publish to the Chrome Web Store

    • This skill can help you implement each step in detail.

    What are the differences between Manifest V3 and V2?

    Manifest V3 is the new standard for Chrome extensions; the main changes include:

    AspectManifest V2Manifest V3
    Background scriptbackground page (persistent)Service Worker (event-driven)
    Content securityno restriction on remote coderemote code prohibited, eval disallowed
    Host permissions<all_urls>activeTab + specific permissions
    API changeschrome.extensionchrome.runtime + chrome.action

    V3’s advantages are better security, performance, and privacy protection. If you have a V2 extension that needs migration, this skill provides a detailed migration guide.

    How can a browser extension make money?

    Common monetization models for extensions include:

  • One-time payment: users pay to download or unlock premium features

  • Subscription: monthly/yearly subscriptions, suitable for tools with ongoing updates

  • In-app purchases/unlocks: basic features free, premium features paid

  • Enterprise licensing: provide custom versions and support to corporate clients

  • Affiliate marketing: promote related products within the extension to earn commissions

  • Data services: provide data analysis or API services (pay attention to privacy)

    • When monetizing, be sure to clearly describe paid features, offer free trials, handle refund requests, and comply with store policies. This skill can help you design an appropriate monetization strategy.