Examine source code of Zoom Path Tracker

{
  "manifest_version": 2,
  "name": "Zoom Path Tracker",
  "version": "1.0",
  "description": "Displays a faint light trail of mouse movement when an image is zoomed in.",
  "permissions": [
    "activeTab"
  ],
  "icons": {
    "48": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{13051db2-8c4c-4779-9fe5-0cdfb2680fb5}"
    }
  }
}