Examine source code of Android themed Calculator

{
  "manifest_version": 2,
  "name": "Android themes Calculator",
  "version": "1.0.0",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "Acontent.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "android.html",
    "default_title": "V.v",
    "default_icon": {
      "16": "aicons/android.png",
      "48": "aicons/android.png",
      "128": "aicons/android.png"
    }
  },
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "icons": {
    "16": "aicons/android.png",
    "48": "aicons/android.png",
    "128": "aicons/android.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{18cb5a51-527c-4de3-8ea3-74eb53cf3803}"
    }
  }
}