Examine source code of GaiaUpgrade

{
  "name": "GaiaUpgrade",
  "description": "A third-party tool to improve interacting with GaiaOnline.",
  "version": "1.37.0",
  "author": "Gaia Tools",
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "gaiaupgrade@gaiatools.com",
      "strict_min_version": "109.0"
    }
  },
  "permissions": [
    "alarms",
    "downloads",
    "notifications",
    "storage",
    "declarativeNetRequest"
  ],
  "host_permissions": [
    "*://*.gaiaonline.com/*",
    "*://gaiatools.com/*"
  ],
  "icons": {
    "16": "logos/gu_16x16.png",
    "48": "logos/gu_48x48.png",
    "128": "logos/gu_128x128.png"
  },
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "action": {
    "default_icon": {
      "16": "logos/gu_16x16.png",
      "32": "logos/gu_32x32.png"
    },
    "default_title": "GaiaUpgrade"
  },
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "login_rewards",
        "enabled": false,
        "path": "rules/login_rewards.json"
      }
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.gaiaonline.com/*"
      ],
      "exclude_matches": [
        "*://*.gaiaonline.com/auth/*",
        "*://*.gaiaonline.com/gaiagames/*"
      ],
      "js": [
        "scripts/jquery.min.js",
        "scripts/foundation.min.js",
        "scripts/gaiaupgrade.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "css/*.css",
        "scripts",
        "images/*",
        "fonts/*"
      ],
      "matches": [
        "https://*.gaiaonline.com/*"
      ]
    }
  ]
}