Examine source code of Curio Saver

{
  "manifest_version": 3,
  "name": "Curio Saver",
  "version": "1.3",
  "description": "Add a webpage to Curio",
  "browser_specific_settings": {
    "gecko": {
      "id": "gecko@curi.ooo"
    }
  },
  "permissions": [
    "activeTab",
    "scripting",
    "tabs",
    "contextMenus",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "toast.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "content_scripts": [
    {
      "matches": [
        "https://curi.ooo/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/curio_logo_16.png",
      "48": "icons/curio_logo_48.png",
      "128": "icons/curio_logo_128.png"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "icons/curio_logo_16.png",
    "48": "icons/curio_logo_48.png",
    "128": "icons/curio_logo_128.png"
  }
}