Examine source code of Magnic: Zoom Into Images

{
  "manifest_version": 2,
  "name": "Magnic",
  "version": "1.5.1",
  "description": "Need a closer look? Zoom into images like magic - just double-tap Ctrl.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage",
    "unlimitedStorage",
    "downloads",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "jsQR.min.js",
        "image-viewer.js",
        "image-editor.js",
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    },
    "default_title": "Magnic",
    "default_popup": "popup.html"
  },
  "web_accessible_resources": [
    "icons/*",
    "images/*",
    "content.css"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "magnic@extension",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}