Examine source code of Reading Queue Manager

{
  "manifest_version": 3,
  "name": "Reading Queue Manager",
  "version": "1.0",
  "description": "Save and manage webpages you want to read later in a convenient reading queue.",
  "permissions": [
    "storage",
    "tabs",
    "scripting"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "128": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ac2aa7a7-33f0-4d86-bbb2-84e58e6c02a7}"
    }
  }
}