Examine source code of PMMG Mobile

{
  "manifest_version": 2,
  "name": "PMMG Mobile",
  "description": "Improve and tweak the interface elements of the mobile PrUn interface",
  "version": "1.0.3",
  "icons": {
    "128": "icon128.png"
  },
  "permissions": [
    "https://apex.prosperousuniverse.com/",
    "storage",
    "scripting"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://apex.prosperousuniverse.com/*"
      ],
      "js": [
        "main.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9d68b0a9-cd65-4e18-81fe-98381f6b0da1}"
    }
  }
}