Extension Manifest

Community

quangpl

extension-manifest

Generate and validate manifest.json with optimal permissions for Chrome MV3 extensions. Analyzes code to determine minimum permissions. Use when: manifest, permissions, manifest.json.

Overview

Publisher	quangpl
Repository	`browser-extension-skills`
Skill name	`extension-manifest`
Stars	65
Forks	10
Bundled files	6
License	MIT
Links	Skill source Repository

Markdown instructions
A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.
Works with any LLM
AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.
6 bundled files
Scripts, templates, and references the model can read while it works. Files are read-only and never executed.
Open source
Published by quangpl on GitHub. Read the source before you install it.

Installation

Install the Extension Manifest AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

Open the app and go to Plugins → Skills.
Choose "Install from GitHub".
Paste the skill folder URL below and confirm.
https://github.com/quangpl/browser-extension-skills/tree/main/skills/extension-manifest
Enable the skill in any chat where you want it available.

Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills

git clone --depth 1 https://github.com/quangpl/browser-extension-skills.git /tmp/browser-extension-skills
mkdir -p .claude/skills
cp -r /tmp/browser-extension-skills/skills/extension-manifest .claude/skills/extension-manifest

Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Extension Manifest in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Extension Manifest on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Extension Manifest is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

Loaded only when it is needed
The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.
Switch models mid-chat
Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

Extension Manifest & Permissions Generator

🚀 Upgrade to Premium Get the Premium version at https://app.extensionbooster.net/dashboard/services/extension-ai-kit

Generate the best manifest.json based on current extension implementation. Analyze code to determine minimum permissions following Chrome docs and best practices.

Workflow

Detect framework: check for wxt.config.ts, crxjs.config.ts, or raw manifest.json
Scan the extension codebase for Chrome API usage
Map each API call to its required permission (see references/api-permission-map.md)
Generate manifest.json with minimum required permissions
Validate against Chrome docs and CWS policies
Report permission warnings users will see

CRXJS projects: Manifest is auto-generated from code and package.json. Override via crxjs.config.ts. See https://docs.crxjs.com/

Docs References

Manifest reference: https://developer.chrome.com/docs/extensions/reference/manifest
Permissions list: https://developer.chrome.com/docs/extensions/reference/permissions-list

Quick Manifest Template

json
{
  "manifest_version": 3,
  "name": "Extension Name",
  "version": "1.0.0",
  "description": "Brief description. Max 132 chars for CWS.",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": { "16": "icons/icon16.png" }
  },
  "permissions": [],
  "host_permissions": [],
  "background": { "service_worker": "background.js", "type": "module" }
}

Permission Analysis Steps

Grep codebase for chrome. API calls
Map each to permission using references/api-permission-map.md
Prefer activeTab over tabs + host_permissions when possible
Use optional permissions for non-essential features
Check warning text in references/permission-warnings.md

Common Mistakes

Error	Fix
`host_permissions` inside `permissions`	Move URLs to separate `host_permissions` array
Using `<all_urls>`	Narrow to specific domain patterns
Missing `activeTab`	Add when only needing current tab on user click
`tabs` permission overuse	Only needed for tab URL/title; use `activeTab` instead
`content_security_policy` as string	Must be object: `{ "extension_pages": "..." }`
`web_accessible_resources` as string[]	Use object with `resources` + `matches`

Key MV3 Rules

host_permissions is separate from permissions
Service workers replace background pages (no DOM, no window)
content_security_policy is an object, not string
Remote code execution banned (no eval, no CDN scripts)
web_accessible_resources requires matches array
Use chrome.scripting.executeScript() not tabs.executeScript()

References

references/manifest-fields-reference.md - All manifest fields with types and examples
references/manifest-templates.md - Ready-to-use templates (popup, content script, sidepanel, devtools)
references/manifest-validation-checklist.md - Pre-submission validation
references/api-permission-map.md - Chrome API → permission mapping
references/permission-warnings.md - User-facing warning text per permission
references/permission-strategies.md - Optional permissions, activeTab, escalation patterns

Related Skills

extension-create - Full project scaffolding
extension-analyze - Security audit and best practices

Bundled files

The model reads these on demand while the skill is loaded. They are exposed as readable files and are never executed.

Frequently asked questions

What does the Extension Manifest AI skill do?

Generate and validate manifest.json with optimal permissions for Chrome MV3 extensions. Analyzes code to determine minimum permissions. Use when: manifest, permissions, manifest.json.

Why use Extension Manifest on TypingMind?

Because you install it once and use it with any model. Extension Manifest is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Extension Manifest in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/quangpl/browser-extension-skills/tree/main/skills/extension-manifest. TypingMind reads its SKILL.md and bundles its files and installs it as a skill you can enable per chat.

Which AI models can use Extension Manifest?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Extension Manifest?

As many as you like. As long as a model supports skills, you can use Extension Manifest with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Extension Manifest AI skill free?

Yes. It is published on GitHub by quangpl under the MIT license. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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Overview

Installation

Install in TypingMind

Install in another agent

Use it in TypingMind

Works with any AI model

Skill instructions

Extension Manifest & Permissions Generator

Workflow

Docs References

Quick Manifest Template

Permission Analysis Steps

Common Mistakes

Key MV3 Rules

References

Related Skills

Bundled files

Frequently asked questions

Related AI Skills

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