Examine source code of hide google meet

{
  "manifest_version": 2,
  "name": "hide google meet",
  "version": "1.0.1",
  "author": "chv - netfree user & netfree fan",
  "permissions": [
    "https://mail.google.com/mail/*"
  ],
  "description": "hides google meet from gmail page",
  "icons": {
    "128": "icon.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icon.png",
      "32": "icon.png"
    }
  },
  "content_scripts": [
    {
      "all_frames": true,
      "css": [
        "hide.css"
      ],
      "matches": [
        "https://mail.google.com/mail/*"
      ]
    }
  ]
}