If you are a non-developer planning a browser extension, the first confusing question is not “how do I code this?” It is “which browser should I build for first?”

Chrome, Firefox, and Safari all support the WebExtensions model, but the day-to-day experience is different. Chrome is usually the easiest place to start, Firefox is friendly for cross-browser add-ons, and Safari matters when your audience lives on Mac and iOS but requires more Apple-specific packaging.

Quick recommendation

Your situation	Start here
You want the easiest first local test	Chrome
You already have a Chrome extension and want another audience	Firefox
Your users are Mac-heavy or ask for Safari	Safari
You want one codebase across browsers	Chrome first, then Firefox, then Safari
You want to sell Pro access without payment servers	Any browser + Payhook

The best order for most creators is Chrome -> Firefox -> Safari. That lets you validate the idea before taking on Xcode and App Store review.

What is the same across browsers

The shared concept is WebExtensions. A typical extension has:

• A manifest.json file.
• A popup shown from the toolbar icon.
• Scripts that run in the background or on matching web pages.
• Permissions that tell the browser what the extension can access.

Chrome’s official manifest docs explain the structure of manifest.json, Mozilla documents WebExtensions for Firefox on MDN, and Apple supports Safari Web Extensions through Xcode and App Store distribution.

For a non-developer, that means your AI assistant can often reuse the same product brief and much of the same code.

What is different

Topic	Chrome	Firefox	Safari
Local testing	Load unpacked at chrome://extensions	Temporary load at about:debugging	Run a containing app in Xcode, then enable in Safari Settings
Store	Chrome Web Store	Firefox Add-ons (AMO)	Mac App Store or direct distribution
Extra manifest detail	Manifest V3 default	Often needs browser_specific_settings.gecko	Wrapped in a Safari Web Extension app
Beginner friction	Low	Low to medium	Medium to high
Good first audience	Broad consumer and productivity users	Privacy-conscious and cross-browser users	Mac users and Apple ecosystem buyers

The extension idea can stay the same. The packaging and review flow changes.

Chrome: easiest first test

Chrome is usually the fastest path from idea to working popup:

1. Ask AI to create a Manifest V3 extension.
2. Open chrome://extensions.
3. Enable Developer mode.
4. Click Load unpacked and choose the folder.
5. Reload after every change.

Use Create a Chrome extension without coding for the beginner flow or Create your first Chrome extension with Claude Code if you are comfortable using an agent in a project folder.

Firefox: similar idea, slightly different rules

Firefox add-ons are also WebExtensions, but the manifest may need a unique gecko ID:

"browser_specific_settings": {
  "gecko": {
    "id": "your-addon@example.com"
  }
}

Firefox temporary testing uses about:debugging. For publishing, you submit to Firefox Add-ons (AMO).

Useful next reads:

• Create a Firefox extension without coding
• Firefox extension Manifest V3 starter
• Publish a Firefox extension to AMO

Safari: powerful, but Apple packaging matters

Safari Web Extensions reuse familiar web technologies, but they are wrapped in a macOS app. Apple says Safari extensions can be created in Xcode and distributed through the App Store Extensions category.

That makes Safari a better second or third browser for most non-developers. You may need:

• A Mac.
• Xcode.
• Apple Developer Program membership for serious distribution.
• App Store Connect metadata and review notes.

Start with Create a Safari extension without coding or Safari Web Extension Manifest V3 starter.

Payments: do not solve this three times

The browser-specific store is not the best place to design your Pro unlock.

Chrome Web Store payments are deprecated. Firefox and Safari distribution flows are different. If you build separate payment logic for each browser, you will spend more time on billing than on the extension.

Payhook gives you one monetization pattern:

Popup Upgrade button -> hosted Stripe checkout -> Payhook entitlement -> Pro feature unlock

That can sit behind Chrome, Firefox, and Safari builds without your extension collecting card numbers or hosting a custom license API.

Which browser should you publish first?

Publish the browser where you can prove the extension solves a real problem.

For most non-developers:

1. Build and test in Chrome.
2. Add Payhook for Pro if the free version is useful.
3. Port to Firefox when the code is stable.
4. Add Safari when Mac users ask for it or the product has Apple-heavy demand.

That order keeps risk small and lets your content, support, and Payhook product setup carry across browsers.

Next steps

• How to create a browser extension without coding
• 25 browser extension ideas for non-developers
• Monetize a browser extension without a payment backend