Examine source code of Focus Booster V2

{
  "manifest_version": 2,
  "name": "Focus Booster V2",
  "version": "1.3",
  "description": "A Pomodoro-style productivity extension to help you stay focused and track tasks.",
  "permissions": [
    "storage",
    "notifications"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "64": "icons/logo_64.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5ab966e3-8094-454e-ad10-82d777d405e7}"
    }
  }
}