Examine source code of Pardus MultiClock

{
  "manifest_version": 2,
  "name": "Pardus Multi Clock",
  "author": "Miche",
  "version": "2.2.3",
  "description": "Display a selection of clocks that represent various events that occur within Pardus (a MMORPG set in space).",
  "icons": {
    "16": "icons/icon_16.png",
    "32": "icons/icon_32.png",
    "64": "icons/icon_64.png",
    "128": "icons/icon_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.pardus.at/menu.php"
      ],
      "js": [
        "clock.js"
      ],
      "css": [
        "clock.css"
      ],
      "all_frames": true,
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "icons/icon_16.png",
      "32": "icons/icon_32.png",
      "64": "icons/icon_64.png",
      "128": "icons/icon_128.png"
    },
    "default_title": "Pardus Multi Clock",
    "default_popup": "popup/popup.html",
    "default_area": "navbar"
  },
  "options_ui": {
    "page": "options/options.html",
    "chrome_style": true,
    "browser_style": true
  },
  "web_accessible_resources": [
    "images/*.png"
  ],
  "applications": {
    "gecko": {
      "id": "pardusmulticlock@xcom-alliance.info",
      "strict_min_version": "56.0"
    }
  }
}