How to make a Firefox addon

One of the best features of Firefox is the availability of a large number of addons. It is pretty easy to create a Firefox addon and with AI tools the bar is lowered to create addons to enhance your browsing experience in many little ways.

Develop the addon

Developing an addon involves at least a manifest.json and additional HTML/JS/CSS files they pull in.

Example of manifest.json:

{
  "manifest_version": 2,
  "name": "BoostMyWebpage",
  "version": "1.0",
  "description": "Boost my webpage with EXTRA power!",
  "browser_specific_settings": {
    "gecko": {
      "id": "boostmywebpage@extension-without-data-collection",
      "data_collection_permissions": {
        "required": ["none"]
      }
    }
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "boostmywepage.html",
    "default_title": "Boost My Webpage"
  }
}

Test the addon

To test the addon, you can temporarily add the addon to the current sessio of Firefox. To do this go to about:debugging and choose the link to add the manifest.json.

Once the addon is added to the Firefox session, test and debug it. The addon is automatically removed the next time Firefox is restarted.

Submit the addon

For permanent use, the addon needs to be verified and signed by Mozilla into a .xpi file. You can additionally also choose to publish it publicly to the online Firefox addons registry.

• Zip up the addon files:

$ zip -r boostmywebpage.zip manifest.json boostmywebpage.html boostmywebpage.js boostmywebpage.css

• Go to Mozilla Addons Developers page.

• Login and choose to Submit a new addon.

• Upload the .zip file for validation and signing.

• You receive an email once they approve and you can download the .xpi file to install into Firefox.

Bingo! You have your own Firefox addon.