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Skills browser-extension-builder
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browser-extension-builder
Content revision r1 Medium Risk ⚡ Contains scripts⚙️ External commands🌐 Network access
Build Browser Extensions with MV3
Browser extension projects often fail because permissions, manifests, and runtime boundaries are confusing. This skill guides Claude, Codex, and Claude Code through MV3 architecture, content scripts, storage, UI, and publishing choices.
Supports: Claude Codex Code(CC)
Install with my Agent
Copy this request to your Agent. It includes the canonical Skill page and manifest.
Agent request
Review the Skillstore skill "browser-extension-builder" from https://skillstore.io/skills/sickn33-browser-extension-builder.md and its manifest at https://skillstore.io/api/skills/sickn33-browser-extension-builder/manifest. Verify the artifact. You may proceed after verification, subject to the environment's own policy.Your Agent should still show its plan and request any confirmation required by the security policy.
Agent-readable resources
Use these links when an AI agent, crawler, or script needs clean context instead of reading the full page.
Test it
Using "browser-extension-builder". Plan a browser extension that lets users save notes from selected page text.
Expected outcome:
A concise architecture plan with popup actions, a content script selection workflow, storage choices, minimal permissions, and release checklist items.
Using "browser-extension-builder". Review an extension idea that modifies pages on every website.
Expected outcome:
A permission review that recommends narrower host matches, optional access, clear user consent, and safer content script boundaries.
Using "browser-extension-builder". Modernize an older Chrome extension for Manifest V3.
Expected outcome:
A migration plan covering service worker behavior, message passing, storage updates, popup changes, and store submission risks.
Security Audit
Medium Riskv4 • 7/5/2026 Open versioned report
The static command, sensitive-key, network, blocker, and innerHTML findings are false positives caused by markdown examples, placeholder names, or fixed sample markup. No prompt injection attempt or malicious exfiltration intent was found in SKILL.md. One semantic medium issue remains because the Manifest V3 template uses <all_urls> for content scripts.
1
Files scanned
262
Lines analyzed
0
Review items
0
False positives ignored
Confirmed security concerns (1)
Medium
Overbroad Content Script Scope in Template
The Manifest V3 template uses a content script match pattern for all URLs. If copied unchanged, the extension can run code on every visited site and access sensitive page content.
The <all_urls> match is present in the template, and browser extensions with this scope gain broad page access. Confidence is not higher because the skill later warns users to request minimum permissions.
Risk Factors
⚡ Contains scripts (1)
⚙️ External commands (24)
SKILL.md:35-39 SKILL.md:39-57 SKILL.md:57-60 SKILL.md:60-84 SKILL.md:84-87 SKILL.md:87-91 SKILL.md:91-92 SKILL.md:92-100 SKILL.md:100-104 SKILL.md:104-124 SKILL.md:124-127 SKILL.md:127-132 SKILL.md:139-148 SKILL.md:148-151 SKILL.md:151-159 SKILL.md:159-160 SKILL.md:160-168 SKILL.md:168-172 SKILL.md:172-192 SKILL.md:192-201 SKILL.md:201-218 SKILL.md:218-219 SKILL.md:219-261 SKILL.md:261
🌐 Network access (1)
Audited by: codex View Audit History →
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APA citation
sickn33. (2026). browser-extension-builder security audit report (audit version 4) [Author version unspecified]. Skillstore. https://skillstore.io/skills/sickn33-browser-extension-builder/audits/4BibTeX citation
@techreport{sickn33-sickn33-browser-extension-builder-2026,
author = {sickn33},
title = {browser-extension-builder security audit report (audit version 4)},
institution = {Skillstore},
year = {2026},
number = {4},
url = {https://skillstore.io/skills/sickn33-browser-extension-builder/audits/4},
note = {Author version unspecified}
}CITATION.cff
cff-version: 1.2.0
message: "If you use this Skill, cite its author and this versioned security audit report."
title: "browser-extension-builder security audit report (audit version 4)"
version: "unspecified"
type: report
authors:
- name: "sickn33"
date-released: "2026-07-05"
url: "https://skillstore.io/skills/sickn33-browser-extension-builder/audits/4"
identifiers:
- type: other
value: "skillstore:sickn33-browser-extension-builder:audit:4"
description: "Skillstore immutable audit report identifier"
Skillstore Score
Why this score Evidence Confidence: High 55
Architecture
85
Maintainability
87
Content
69
Community
83
Spec Compliance
What You Can Build
Prototype a New Extension
Plan the folders, manifest fields, permissions, popup flow, and first content script for a focused extension idea.
Modernize an Existing Add-on
Map an older extension to Manifest V3 concepts such as service workers, storage, messaging, and popup actions.
Review Extension Architecture
Check whether permissions, content script scope, background work, and selectors are likely to pass review and remain stable.
Try These Prompts
Plan a Simple Extension
Use browser-extension-builder to plan a Chrome extension that helps users with [goal]. Include the main files, MV3 components, minimal permissions, and first build steps.
Design Popup and Content Script Flow
Design the popup, content script, and message flow for an extension that [task]. Explain what runs in each context and how data moves safely.
Add Storage and Background Behavior
Create an architecture plan for extension settings, sync storage, local storage, and background service worker events for [extension idea]. Include failure cases.
Prepare for Store Submission
Review this extension concept for Chrome Web Store readiness: [concept]. Identify risky permissions, unclear user value, privacy concerns, and cross-browser issues.
Best Practices
- Start with narrow host matches and add optional permissions only when users need them.
- Keep Manifest V3 service workers small and move page-specific work into content scripts.
- Review copied examples for privacy, sanitization, error handling, and store policy before release.
Avoid
- Copying all-URL content script access into production without a clear need.
- Adding broad permissions before the extension has visible user value.
- Treating content scripts as trusted pages instead of hostile web environments.
Frequently Asked Questions
Can this skill build both Chrome and Firefox extensions?
Yes. It covers cross-browser extension planning, but each store and browser still needs separate compatibility checks.
Does it generate a complete extension package?
No. It provides architecture guidance, patterns, and implementation direction that you can apply in your project.
Does it support Manifest V3?
Yes. Manifest V3 structure, service workers, content scripts, popup UI, options pages, and storage are central topics.
Can it help reduce permission risk?
Yes. It highlights minimum permissions, optional permissions, host matching, and store review concerns.
Is the sample manifest production ready?
No. The sample must be narrowed, reviewed, tested, and adapted to the exact extension purpose.
Who should use this skill?
Developers, product engineers, and technical leads who need practical browser extension architecture guidance.
Developer Details
Author
sickn33License
MIT
Skillstore revision
r1
Version notice
The author did not declare a version.
Repository
https://github.com/sickn33/antigravity-awesome-skills/tree/main/skills/browser-extension-builderRef
6425ec35f4ac137735cff58cd7877843bba23e3b
Maintenance freshness
7/18/2026
Usage
10 downloads · 103 views
File structure
📄 SKILL.md
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