Examine source code of Tab Double-Click Close

{
  "manifest_version": 2,
  "name": "Tab Double-Click Close",
  "version": "1.0.0",
  "description": "Close any tab by double-clicking it. Simple, lightweight, and native — no bloat.",
  "author": "DonPedroTV",
  "homepage_url": "https://github.com/DonPedroTV/Tab-Double-Click-Close---Firefox-Addon",
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "permissions": [
    "browserSettings"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon48.png"
    },
    "default_title": "Tab Double-Click Close",
    "default_popup": "popup/popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tab-double-click-close@donpedrotv",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}