Examine source code of Styled XML Viewer

{
  "name": "Styled XML Viewer",
  "description": "Beautiful, readable formatting for XML files in the browser.",
  "version": "1.2",
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "xmlviewer@netbuddy.net",
      "strict_min_version": "109.0"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "24": "icon-24.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "permissions": [
    "declarativeNetRequest",
    "storage",
    "webNavigation"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Styled XML Viewer",
    "default_popup": "popup.html"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "viewer.html"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "xml-redirect-rules",
        "enabled": true,
        "path": "rules.json"
      }
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "file://*/*.xml",
        "file://*/*.xsl",
        "file://*/*.xslt",
        "file://*/*.xsd",
        "file://*/*.wsdl",
        "file://*/*.opf",
        "file://*/*.gpx",
        "file://*/*.plist",
        "file://*/*.csproj",
        "file://*/*.vbproj",
        "file://*/*.resx",
        "file://*/*.pom",
        "file://*/*.ui",
        "file://*/*.xaml",
        "file://*/*.scxml",
        "file://*/*.tmx",
        "file://*/*.xliff",
        "*://*/*.xml",
        "*://*/*.xsl",
        "*://*/*.xslt",
        "*://*/*.xsd",
        "*://*/*.wsdl",
        "*://*/*.opf",
        "*://*/*.gpx",
        "*://*/*.plist",
        "*://*/*.csproj",
        "*://*/*.vbproj",
        "*://*/*.resx",
        "*://*/*.pom",
        "*://*/*.ui",
        "*://*/*.xaml",
        "*://*/*.scxml",
        "*://*/*.tmx",
        "*://*/*.xliff"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}