Examine source code of OpenLink YouID

{
  "name": "OpenLink YouID",
  "short_name": "youid",
  "author": "OpenLink Software",
  "version": "1.7.20",
  "manifest_version": 3,
  "minimum_chrome_version": "18",
  "description": "YouID selector.",
  "browser_specific_settings": {
    "gecko": {
      "id": "youid@openlinksw.com",
      "strict_min_version": "109.0"
    }
  },
  "icons": {
    "16": "images/icon20.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "action": {
    "default_icon": "images/icon20.png",
    "default_title": "YouID",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "browser.js",
      "settings.js",
      "utils2.js",
      "background.js",
      "service_worker_ff.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "file:///*/*",
        "*://*/*"
      ],
      "js": [
        "browser.js",
        "content-script.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://openlinksoftware.github.io/*"
      ],
      "js": [
        "browser.js",
        "lib/solid-client-authn.bundle.js",
        "oidc-webid-inject.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://www.google.com/robots.txt*",
        "http://www.facebook.com/robots.txt*",
        "https://login.live.com/oauth20_desktop.srf*",
        "http://id.myopenlink.net/OAuthCallback*",
        "https://id.myopenlink.net/OAuthCallback*"
      ],
      "js": [
        "oauth2/oauth2_inject.js"
      ],
      "run_at": "document_start"
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "host_permissions": [
    "<all_urls>",
    "https://accounts.google.com/o/oauth2/token"
  ],
  "permissions": [
    "storage",
    "declarativeNetRequest",
    "tabs"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "oauth2/oauth2.html"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self' ; object-src 'self' moz-extension://lib; style-src 'self' 'unsafe-inline' moz-extension://lib https://solid.openlinksw.com; media-src 'self' 'unsafe-inline' moz-extension://lib ;"
  }
}