Examine source code of seenami

{
  "name": "__MSG_appName__",
  "description": "__MSG_appDescription__",
  "version": "2.0.2",
  "short_name": "__MSG_appShortName__",
  "author": "10 Nanos Inc.",
  "manifest_version": 2,
  "default_locale": "en",
  "icons": {
    "16": "images/icon-16.png",
    "128": "images/icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://search.seenami.com/*"
      ],
      "all_frames": true,
      "run_at": "document_end",
      "js": [
        "scripts/content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "scripts/background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "activeTab",
    "tabs",
    "webNavigation",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ]
}