Examine source code of Kaltura Video Speed Controller

{
  "manifest_version": 3,
  "name": "Kaltura Video Speed Controller",
  "version": "1.6",
  "description": "Control HTML5 video playback speed on Kaltura. Before using this extension, please right click the video and select \"This Frame\" \\ \"Open Frame in New Tab\" then you can use the extension.",
  "icons": {
    "16": "icons/icon_16.png",
    "32": "icons/icon_32.png",
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "kaltura-speed-controller@yourdomain.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage",
    "webNavigation"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon_16.png",
      "32": "icons/icon_32.png",
      "48": "icons/icon_48.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.kaltura.com/*",
        "*://cdnapisec.kaltura.com/*",
        "*://*.unitelma.it/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}