Examine source code of SmartCast

{
  "manifest_version": 3,
  "name": "SmartCast",
  "version": "1.0.8",
  "short_name": "SmartCast",
  "description": "A simple helper extension for SmartCast",
  "icons": {
    "16": "icons/png/16x16.png",
    "32": "icons/png/32x32.png",
    "48": "icons/png/48x48.png",
    "128": "icons/png/128x128.png"
  },
  "action": {
    "default_icon": {
      "16": "icons/png/16x16.png",
      "32": "icons/png/32x32.png",
      "48": "icons/png/48x48.png"
    },
    "default_title": "SmartCast",
    "default_popup": "popup.html"
  },
  "background": {
    "page": "page.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "smartcastaddon@fire-arc.com",
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "homepage_url": "https://smartcastaddon.com/"
}