Examine source code of Eco-Friendly Browsing

{
  "manifest_version": 2,
  "name": "Eco-Friendly Browsing",
  "version": "1.0",
  "description": "Track and display the amount of carbon emissions saved while browsing.",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/icon.png"
  },
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{20f89e62-1baf-4849-9e9f-4e3b978d7ccd}"
    }
  }
}