Examine source code of Monk Mode

{
  "manifest_version": 2,
  "name": "Monk Mode",
  "version": "1.0",
  "description": "Blocks certain websites/pages to avoid procrastination and maximize productivity.",
  "icons": {
    "48": "icons/logo-w-48.png",
    "96": "icons/logo-w-96.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "monk-mode.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a93a73a7-5c28-42c5-a220-a6a600afca5d}"
    }
  }
}