Examine source code of wCheckw

{
  "manifest_version": 2,
  "name": "wCheckw",
  "version": "1.0",
  "description": "You can create a TODO list with this extension, it has some additional features like URL and state for each work",
  "icons": {
    "128": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "wCheckw"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.mozilla.org/*"
      ],
      "js": [
        "core.js"
      ]
    }
  ],
  "permissions": [
    "storage"
  ]
}