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Building a Manifest V3 browser extension v1.0.0

Use this resource to build a browser extension that works on Chrome and Firefox

New

  • 362 downloads
  • 189 likes
  • 224 saves

Free

Install with the CLI

In a terminal, from the folder you want:

npx --yes palatekit@latest install browser-extension-development-2

With no option, the skill goes to ~/.agents/skills/; add --agent claude-code (or codex, cursor…) to target an agent.

First time: connect the CLI with

npx --yes palatekit@latest login

The agent structures an extension under Manifest V3: manifest, service worker, content scripts, popup and storage. It flags the differences with Firefox and proposes a minimal permission strategy. You get an extension base ready to load.

Mostly picked by

Updated November 2, 2026

Card for the “Building a Manifest V3 browser extension” skill

Details

Works in
Install guides
Generates with
Your agent's model
Licence
MIT

Similar resources

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What you get

  • SKILL.md: extension structure and manifest configuration
  • SKILL.md: service worker, content scripts and popup UI
  • SKILL.md: storage, Firefox compatibility and permission strategy

Good fit for

  • You want to add a tool to Chrome or Firefox for your users
  • Your extension must work in both browsers

Not for

    Tags

    • extension
    • browser
    • manifest v3
    • chrome
    • firefox

    About

    You say

    “Build a Manifest V3 extension that highlights prices on comparison pages, with a settings popup.”

    Card for the “Building a Manifest V3 browser extension” skill

    Skill published by 4444j99 under the MIT license, delivered in its original version.

    Show more

    How to use it

    1. Install the skill in your agent's skills folder
    2. Ask your agent to build a browser extension that works on Chrome and Firefox
    3. Review and adjust the result

    Content preview

    Files

    • LICENSE11.1 KB
    • NOTICE-PALATEKIT.md0.5 KB
    • SKILL.md7.5 KB

    Origin and licence

    Listed unmodified

    Author
    4444j99
    Source
    github.com/4444j99/a-i--skills/tree/df5445878f12d78d81ec48571fa11063f9a5cd46/skills/development/browser-extension-patterns
    Licence
    MIT

    Notice

    « browser-extension-patterns » (4444j99, MIT) livré dans sa version d'origine : fiche en français et en anglais par PalateKit.

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