Examine source code of Kamo

{
  "name": "__MSG_extName__",
  "description": "__MSG_extDescription__",
  "default_locale": "en",
  "version": "1.0",
  "applications": {
    "gecko": {
      "id": "kamo@ccleaner.com"
    }
  },
  "icons": {
    "16": "images/kamo16.png",
    "24": "images/kamo24.png",
    "32": "images/kamo32.png",
    "48": "images/kamo48.png",
    "64": "images/kamo64.png",
    "128": "images/kamo128.png"
  },
  "manifest_version": 2,
  "content_scripts": [
    {
      "run_at": "document_start",
      "js": [
        "contentscript.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "permissions": [
    "tabs",
    "nativeMessaging",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "main.js"
    ]
  }
}