Examine source code of SimplyFocus

{
  "manifest_version": 3,
  "name": "SimplyFocus",
  "version": "1.0.1",
  "description": "A simple countdown timer with a visual indicator",
  "sidebar_action": {
    "default_panel": "index.html?context=sidebar",
    "default_title": "SimplyFocus",
    "open_at_install": false
  },
  "action": {
    "default_popup": "index.html?context=popup",
    "default_title": "SimplyFocus",
    "theme_icons": [
      {
        "light": "icons/icon-light-16.png",
        "dark": "icons/icon-dark-16.png",
        "size": 16
      },
      {
        "light": "icons/icon-light-32.png",
        "dark": "icons/icon-dark-32.png",
        "size": 32
      },
      {
        "light": "icons/icon-light-48.png",
        "dark": "icons/icon-dark-48.png",
        "size": 48
      }
    ]
  },
  "background": {
    "service_worker": "js/background.js",
    "type": "module",
    "scripts": [
      "js/background.js"
    ]
  },
  "icons": {
    "16": "icons/icon-dark-16.png",
    "32": "icons/icon-dark-32.png",
    "48": "icons/icon-dark-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "simplyfocus@jzhang1221"
    }
  },
  "permissions": [
    "storage",
    "alarms"
  ]
}