Examine source code of MapleScout

{
  "manifest_version": 3,
  "name": "MapleScout",
  "version": "1.1",
  "description": "Highlights Canadian-made products on Amazon.",
  "icons": {
    "96": "images/favicon-96x96.png"
  },
  "permissions": [
    "activeTab"
  ],
  "host_permissions": [
    "*://*.amazon.ca/*",
    "*://*.amazon.com/*"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "images/*"
      ],
      "matches": [
        "*://*.amazon.ca/*",
        "*://*.amazon.com/*"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.amazon.ca/*",
        "*://*.amazon.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": "images/favicon-96x96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "maplescout@example.com"
    }
  }
}