Examine source code of cctv-util

{
  "manifest_version": 2,
  "name": "cctv-util",
  "version": "1.0",
  "description": "隐藏非直播视频的区域",
  "content_scripts": [
    {
      "matches": [
        "*://tv.cctv.com/live/*"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{65e45e9d-91d4-448f-bb8d-42ce22a81750}"
    }
  }
}