Examine source code of Tempo Blocks - Floating Timer

{
  "manifest_version": 3,
  "name": "Floating Focus Timer - Tempo Blocks",
  "short_name": "Tempo Blocks",
  "version": "1.0.1",
  "description": "Run editable Focus Cycles and custom timers in a movable browser widget with alarms, toolbar countdowns, and notifications.",
  "icons": {
    "16": "icons/timer-16.png",
    "32": "icons/timer-32.png",
    "48": "icons/timer-48.png",
    "128": "icons/timer-128.png"
  },
  "permissions": [
    "activeTab",
    "alarms",
    "notifications",
    "scripting",
    "storage"
  ],
  "background": {
    "scripts": [
      "shared.js",
      "background.js"
    ]
  },
  "action": {
    "default_title": "Toggle Tempo Blocks widget",
    "default_icon": {
      "16": "icons/timer-16.png",
      "32": "icons/timer-32.png"
    }
  },
  "options_page": "popup.html",
  "browser_specific_settings": {
    "gecko": {
      "id": "tempo-blocks@wiplash.ai",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}