Examine source code of ati-morpheus

{
  "name": "ati-morpheus",
  "description": "ati.su frontend development helper extension",
  "version": "0.0.16",
  "manifest_version": 2,
  "browser_action": {
    "default_title": "Morpheus",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "morpheus16.png",
    "32": "morpheus32.png",
    "48": "morpheus48.png",
    "128": "morpheus128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.ati.su/*",
        "*://localhost/*",
        "*://*.ati.st/*",
        "*://*.ati.staging-1/*",
        "*://*.ati.staging-2/*",
        "*://*.ati.staging-3/*",
        "*://*.ati.staging-4/*",
        "https://*.ati.team/*"
      ],
      "js": [
        "contentscript.js"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "web_accessible_resources": [
    "versions.js"
  ],
  "permissions": [
    "management"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{905dab16-49c4-49f7-9e03-b9f98f41729f}"
    }
  }
}