This guide will walk you through integrating Mellowtel into your Firefox extension, supporting both Manifest V2 and V3.

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Installation

First, install the Mellowtel Lite (mellowtel-lite) npm package. Please note that for Firefox you can only import the mellowtel-lite package to stay compliant with the browser’s policies regarding ancillary user data: 
npm install mellowtel-lite

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Manifest Configuration

The manifest.json file needs specific configurations for Mellowtel to work properly. Here are the required parts for both Manifest V2 and V3:

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Manifest V2

{
  "manifest_version": 2,
  "permissions": [
    "storage",
    "<all_urls>",
    "declarativeNetRequestWithHostAccess",
  ],
  "background": {
    "scripts": ["background.js"],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": ["<all_urls>"],
      "js": ["content_start_mellowtel.js"],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "browser_action": {
    "default_popup": "popup.html"
  }
}

​
Manifest V3

{
  "manifest_version": 3,
  "permissions": [
    "storage",
    "declarativeNetRequestWithHostAccess"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": ["background.js"],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": ["<all_urls>"],
      "js": ["content_start_mellowtel.js"],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "action": {
    "default_popup": "popup.html"
  }
}

​
Background Script Setup

Create a file named background.js with the following content: 
import Mellowtel from "mellowtel-lite";

let mellowtel;

(async () => {
    mellowtel = new Mellowtel("<your_configuration_key>");
    await mellowtel.initBackground();
})();

browser.runtime.onInstalled.addListener(async function(details) {
    console.log("Extension Installed or Updated");
    await mellowtel.generateAndOpenOptInLink();
});
Replace <your_configuration_key> with your actual Mellowtel configuration key.

​
Content Script Setup

Create a file named content_start_mellowtel.js with the following content: 
import Mellowtel from "mellowtel-lite";

(async () => {
    const mellowtel = new Mellowtel("<your_configuration_key>");
    await mellowtel.initContentScript();
})();
Again, replace <your_configuration_key> with your actual Mellowtel configuration key. To allow users to access Mellowtel settings easily, you should create a popup. Here’s how to set it up:
  1. Create a popup.html file:
<!DOCTYPE html>
<html>
<head>
  <title>Mellowtel Settings</title>
</head>
<body>
  <h1>Mellowtel Settings</h1>
  <button id="openSettings">Open Mellowtel Settings</button>
  <script src="popup.js"></script>
</body>
</html>
  1. Create a popup.js file:
import Mellowtel from "mellowtel-lite";

const mellowtel = new Mellowtel("<your_configuration_key>");

async function openSettings() {
    try {
        const settingsLink = await mellowtel.generateSettingsLink();
        browser.tabs.create({ url: settingsLink });
    } catch (error) {
        console.error("Error generating settings link:", error);
    }
}

document.getElementById('openSettings').addEventListener('click', openSettings);
Remember to replace <your_configuration_key> with your actual Mellowtel configuration key. If you don’t have a configuration key yet, you can get one by signing up at Mellowtel.