Free in-browser tool

A manifest that passes reviewon the first try

A guided MV3 builder for Chrome, Firefox and Edge — validated live against real store policy.

Chrome · Firefox · EdgeLive store-policy checksNothing leaves your browser

manifest.json — Chrome

{
  "manifest_version": 3,
  "name": "My Extension",
  "version": "1.0.0",
  "permissions": ["activeTab", "storage"],
  "host_permissions": ["https://*/*"],
  "action": { "default_popup": "popup.html" }
}

Privacy policy URL required — blocks export Broad host access https://*/* — manual review likely manifest_version 3 · version valid · description present

Why this matters

Most first-time rejections are manifest problems

Missing policy, unjustified permissions, broad host access — flagged as you type, not a week later in a rejection email.

What you get

Built to clear the review queue

Three browsers, one form

Chrome, Firefox and Edge variants. Download each, or all as a zip.

Permissions in plain English

20+ sensitive permissions, each with a plain “what this exposes” label.

Live store-policy validation

Failures block export, warnings advise — each linked to the real store policy text.

Minimal-permission hints

“Use activeTab instead of tabs” — the restraint reviewers approve faster.

Content scripts builder

Match patterns, run timing, and MAIN or ISOLATED world.

Nothing leaves your browser

Generation and validation run client-side. Your manifest never leaves the page.

Missing a privacy policy is the #1 export blocker. Generate one in two minutes →

Keep building

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Pin guide

Illustrated steps that get your extension pinned to the toolbar.

Uninstall feedback

A hosted exit survey — find out why users leave.

Policy generator

A store-ready privacy policy from your permissions.

Icon generator

Draw with your agent, verify in real toolbar mockups.

Stop reverse-engineering store policies from rejection emails.

Build a compliant Manifest V3 for all three stores, see every policy objection as you go, and export clean.

Open the generator

Free · runs in your browser · Chrome, Firefox and Edge.