Examine source code of Video Ending At

{
  "manifest_version": 3,
  "name": "Video Ending At",
  "version": "1.1",
  "description": "Displays the end time of the video on YouTube, Netflix & Amazon Prime Video.",
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "devbuds24@gmail.com",
      "strict_min_version": "109.0"
    }
  },
  "host_permissions": [
    "https://www.netflix.com/*",
    "https://www.primevideo.com/*",
    "https://www.youtube.com/*"
  ],
  "icons": {
    "16": "./assets/icon_16.png",
    "32": "./assets/icon_32.png",
    "48": "./assets/icon_48.png",
    "128": "./assets/icon_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.netflix.com/*",
        "https://www.primevideo.com/*",
        "https://www.youtube.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}