Examine source code of Anti-Procrastinator

{
  "description": "Block websites that waste your time.",
  "manifest_version": 2,
  "name": "Anti-Procrastinator",
  "version": "0.1.0",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "browser_action": {
    "default_icon": "icons/icon-32.png",
    "default_title": "Anti-Procrastinator · Settings",
    "default_popup": "popup/settings.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{996e704f-09b6-43f1-9793-c00dac8cbbde}"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "deprocrastinate.js"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "storage"
  ]
}