Examine source code of exten

{
  "description": "Extension for youtube's video speed and easily embedding videos.",
  "manifest_version": 2,
  "name": "exten",
  "version": "1.1",
  "icons": {
    "16": "icons/exten-16.png",
    "32": "icons/exten-32.png",
    "48": "icons/exten-48.png",
    "128": "icons/exten-128.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_scripts/exten_content.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": false
  },
  "browser_action": {
    "default_icon": "icons/exten-32.png",
    "default_title": "exten",
    "default_popup": "popup/exten_popup.html"
  }
}