Examine source code of Talk Time Tracker - Google Meet

{
  "description": "Track and display the talk time and percent of talking time for each participant in a Google Meet",
  "manifest_version": 3,
  "name": "Talk Time for Google Meet",
  "author": "Matt Kruse (Firefox port, personal use)",
  "version": "3.2.0",
  "homepage_url": "https://EveryoneShouldHaveAVoice.com/",
  "icons": {
    "16": "resources/icons/icon-16.png",
    "19": "resources/icons/icon-19.png",
    "32": "resources/icons/icon-32.png",
    "48": "resources/icons/icon-48.png",
    "128": "resources/icons/icon-128.png",
    "512": "resources/icons/icon-512.png"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://meet.google.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "resources/*.png",
        "resources/icons/*.png"
      ],
      "matches": [
        "https://meet.google.com/*"
      ]
    }
  ],
  "host_permissions": [
    "https://meet.google.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "talk-time-ff@local.personal-use",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}