Examine source code of Frame Recorder

{
  "manifest_version": 2,
  "name": "Frame Recorder",
  "version": "0.0.4",
  "description": "Frame recorder take screenshot of every change in browser during the recording and create video with it",
  "homepage_url": "https://framerecorder.com",
  "icons": {
    "48": "icons/logo.png"
  },
  "permissions": [
    "activeTab",
    "<all_urls>",
    "storage"
  ],
  "background": {
    "scripts": [
      "socket/socket-4.5.1.js",
      "socket/background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/logo.svg",
    "default_title": "Frame Recorder",
    "default_popup": "popup/home.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e2da5ee6-8adf-4141-8733-4a9916b6095d}"
    }
  }
}