Examine source code of Browser Usage Limiter

{
  "manifest_version": 2,
  "name": "Browser Time Limiter",
  "version": "2.0",
  "description": "Tracks daily usage time, reminds you to focus, and blocks Firefox after 3 hours.",
  "permissions": [
    "storage",
    "notifications",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "512": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{05149512-1a9f-418c-9d45-3a542917c62c}"
    }
  }
}