Examine source code of Hey. Discuss everywhere

{
  "name": "Hey. Discuss everywhere",
  "author": "Hey Group",
  "manifest_version": 2,
  "version": "1.0.27resigned1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{2feee4c7-f76e-4112-b56d-4590e5e87b9c}",
      "strict_min_version": "55.0"
    }
  },
  "icons": {
    "16": "img/16x16@1x.png",
    "32": "img/16x16@2x.png",
    "48": "img/48x48@1x.png",
    "96": "img/48x48@2x.png",
    "128": "img/128x128@1x.png",
    "256": "img/128x128@2x.png"
  },
  "description": "Livechat that allows users to discuss on any website.",
  "content_security_policy": "script-src 'self'; object-src 'self';",
  "externally_connectable": {
    "matches": [
      "*://hey.network/*",
      "*://www.hey.network/*"
    ],
    "accepts_tls_channel_id": false
  },
  "web_accessible_resources": [
    "index.html",
    "pixel.png"
  ],
  "permissions": [
    "storage",
    "notifications",
    "tabs",
    "file:///*",
    "http://*/*",
    "https://*/*"
  ],
  "browser_action": {
    "default_title": "Hey extension",
    "default_icon": "img/hey.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "/bundle.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "commands": {
    "toggle-hey": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y",
        "mac": "Command+Shift+Y"
      },
      "description": "Toggle Hey"
    }
  }
}