Examine source code of Image Zoom Timeline

{
  "manifest_version": 2,
  "name": "Image Zoom Timeline",
  "version": "1.0",
  "description": "Automatically zoom images with a timeline effect when hovered.",
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5a99a798-6840-4cec-8e3e-ebd99c299d8b}"
    }
  }
}