Examine source code of Spur

{
  "name": "spur",
  "description": "Simple private URL redirection.",
  "version": "1.5",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "256": "spur.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "clipboardWrite",
    "contextMenus",
    "http://*/*",
    "https://*/*"
  ],
  "options_ui": {
    "browser_style": true,
    "page": "options.html"
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": "spur.png",
    "default_title": "url.gxvwb.dev",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6ad6dcd3-cb1a-41e3-812a-ee44524151ca}"
    }
  }
}