Examine source code of FrameTogether

{
  "name": "FrameTogether",
  "description": "Sync video playback with friends!",
  "version": "1.0.0",
  "permissions": [
    "storage",
    "tabs",
    "https://mubi.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://mubi.com/*"
      ],
      "js": [
        "content/index.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "options_ui": {
    "page": "html/options.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "icons/icon16.png",
    "19": "icons/icon19.png",
    "24": "icons/icon24.png",
    "32": "icons/icon32.png",
    "38": "icons/icon38.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background/index.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "html/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "19": "icons/icon19.png",
      "24": "icons/icon24.png",
      "32": "icons/icon32.png",
      "38": "icons/icon38.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{30f2dc41-70a7-41d8-84dd-4696e0bce483}",
      "strict_min_version": "109.0"
    }
  }
}