Examine source code of RecurAlert

{
  "manifest_version": 2,
  "name": "RecurAlert",
  "version": "1.2.1",
  "description": "Set recurring notifications",
  "permissions": [
    "storage",
    "alarms",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module",
    "persistent": false
  },
  "browser_action": {
    "default_popup": "src/popup/popup.html",
    "default_icon": {
      "48": "static/icon_48.png",
      "64": "static/icon_64.png",
      "128": "static/icon_128.png"
    },
    "web_accessible_resources": [
      "background.js",
      "index.html"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d52cf1ce-34ab-4290-a7f0-82967dfe89f2}"
    }
  }
}