Browser extensions · Updated

Create a Firefox extension without coding (beginner guide + monetization)

Build and test a Firefox add-on from a plain-English brief using AI tools, no programming background required, and sell Pro access with Payhook hosted checkout.

#firefox#webextensions#beginners#no-code#payhook

Firefox uses the same modern extension technology family as Chrome (WebExtensions). That is good news for non-developers: the same AI-generated project can often run in both browsers with small tweaks, and you can still monetize with hosted Stripe checkout through Payhook instead of building billing yourself.

This tutorial assumes you have never written JavaScript. You will describe an idea, let an AI create the files, and load the add-on temporarily in Firefox for testing.

Firefox vs Chrome (what beginners should know)

TopicFirefoxChrome
Load unpublished add-onabout:debugging → This Firefox → Load Temporary Add-onchrome://extensions → Load unpacked
Instruction filemanifest.json (often Manifest V3)Same
Store nameFirefox Add-ons (AMO)Chrome Web Store
Built-in store paymentsNot a simple “turn on IAP” path for most indie creatorsDeprecated (see our Chrome payments post)

For income, plan on Stripe + Payhook from the start - not an in-browser wallet tied to Mozilla’s store.

Step 1 - Write your one-paragraph product brief

Use the same template as our Chrome beginner guide:

Add-on name: ___
What it does for the user: ___
When it should run: ___
Free vs Pro: ___

Keep the first version tiny. One popup button and one clear outcome beats a dozen features.

Step 2 - Generate a Firefox-compatible WebExtension

In your project folder, ask your AI assistant:

Create a Firefox WebExtension (Manifest V3 compatible) in this folder.

Product brief:
[paste your paragraph]

Requirements:
- manifest.json valid for Firefox and Chrome where possible
- Simple popup UI with instructions a non-developer can understand
- Minimal permissions with a README.txt explaining each one
- Placeholder "Upgrade to Pro" button (no payment wiring yet)
- At the end, print steps to load it in Firefox via about:debugging

Firefox sometimes needs an explicit browser_specific_settings block. If loading fails, paste the error back to the AI and ask it to fix compatibility.

Example snippet the AI may add (you do not need to memorize this):

"browser_specific_settings": {
  "gecko": {
    "id": "focus-helper@example.com",
    "strict_min_version": "109.0"
  }
}

Use a unique id (email-style is fine) before you publish to AMO.

Step 3 - Load the add-on in Firefox

  1. Open Firefox and visit about:debugging
  2. Click This Firefox in the left sidebar
  3. Click Load Temporary Add-on…
  4. Choose the manifest.json file inside your project folder
  5. Test from the toolbar icon

Temporary add-ons disappear when Firefox restarts. That is normal while you are learning. Publishing to AMO comes later.

Step 4 - Publish later (optional checklist)

When you are ready for real users outside your laptop:

  1. Create a Firefox Add-on Developer account
  2. Zip your extension folder (AI can give you the exact command)
  3. Submit for review with clear screenshots and a plain-language description
  4. Link your privacy policy if you collect data (Payhook checkout pages help keep card data off your add-on)

Mozilla reviews quality and security; they do not replace your need for a payment flow you control.

Step 5 - Monetize with Payhook (no custom payment server)

Non-developers should not embed credit card forms in a popup. Instead:

  1. Set up Stripe (test mode first)
  2. Connect Stripe in dashboard.payhook.link
  3. Add Payhook’s upgrade button and entitlement checks (quickstart)

Flow for your users:

Click Upgrade in the add-on → secure Payhook / Stripe page → payment recorded → Pro unlocks in the add-on

Tell your AI:

Integrate Payhook for Pro unlock in this Firefox WebExtension.
Use hosted checkout (unlock.payhook.link), not in-popup card fields.
Use Payhook entitlement checks; no custom license API.

The same Payhook setup often works across Firefox and Chrome if you ship both builds.

If you already built for Chrome first

Ask your AI: “Make this extension load in Firefox with the smallest diff - add gecko settings and fix any chrome-only APIs.” Many indie creators ship Chrome first, then Firefox, using one codebase.

Next steps