Examine source code of Stream Together

{
  "manifest_version": 2,
  "name": "Stream Together",
  "description": "Watch any video together with friends.",
  "version": "20.0.0",
  "icons": {
    "16": "logo16.png",
    "48": "logo48.png",
    "128": "logo128.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "web_accessible_resources": [
    "js/*"
  ],
  "browser_action": {
    "default_title": "Watch this video with a group",
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab",
    "clipboardWrite",
    "notifications",
    "http://*/*",
    "https://*/*"
  ]
}