Examine source code of SVG Navigator

{
  "name": "SVG Navigator",
  "description": "Adds zooming and panning capabilities to SVG files",
  "version": "2.9",
  "short_name": "SVG Nav",
  "icons": {
    "16": "icon_16.png",
    "48": "icon_48.png",
    "128": "icon_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "ftp://*/*",
        "file://*/*",
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "options_custom/js/defaultSettings.js",
        "js/svgNavigator.js"
      ],
      "css": [
        "css/svgNavigator.css"
      ]
    }
  ],
  "manifest_version": 3,
  "action": {
    "default_popup": "options_custom/index.html",
    "default_title": "SVG Navigator",
    "default_icon": {
      "16": "icon_16.png",
      "48": "icon_48.png"
    }
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "svg-navigator@prizzventuresllc.com"
    }
  }
}