Examine source code of Micro-Rewind on Double

{
  "manifest_version": 2,
  "name": "Micro-Rewind on Double-Click (RewindTap)",
  "version": "1.0.1",
  "description": "Override double-click on videos to rewind/forward instead of fullscreen.",
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "rewindtap@addon.local",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}