Examine source code of Freshdesk Dark Mode

{
  "manifest_version": 2,
  "name": "Freshdesk Dark Mode",
  "version": "1.7.0",
  "description": "Applies a dark theme to Freshdesk helpdesk portals",
  "icons": {
    "16": "icons/icon16.svg",
    "48": "icons/icon48.svg"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon16.svg",
      "48": "icons/icon48.svg"
    },
    "default_popup": "popup.html",
    "default_title": "Freshdesk Dark Mode"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.freshdesk.com/*"
      ],
      "css": [
        "dark-mode.css"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "match_about_blank": true
    }
  ],
  "permissions": [
    "storage",
    "*://*.freshdesk.com/*"
  ],
  "web_accessible_resources": [
    "page-patch.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "freshdesk-dark-mode@team",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}