Examine source code of Casino Theme Customizer

{
  "manifest_version": 3,
  "name": "Casino Theme Customizer",
  "version": "1.0.0",
  "description": "Customize the appearance of your favorite casino sites with themes, colors, and more.",
  "permissions": [
    "storage",
    "scripting",
    "commands"
  ],
  "host_permissions": [
    "*://stake.us/*",
    "*://stake.com/*",
    "*://stake.ac/*",
    "*://stake.games/*",
    "*://stake.bet/*",
    "*://stake.pet/*",
    "*://stake1001.com/*",
    "*://stake1002.com/*",
    "*://stake1003.com/*",
    "*://stake1021.com/*",
    "*://stake1022.com/*",
    "*://stake.mba/*",
    "*://stake.jp/*",
    "*://stake.bz/*",
    "*://staketr.com/*",
    "*://stake.ceo/*",
    "*://stake.krd/*",
    "https://noembed.com/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "options_page": "about.html",
  "content_scripts": [
    {
      "matches": [
        "*://stake.com/*",
        "*://stake.ac/*",
        "*://stake.games/*",
        "*://stake.bet/*",
        "*://stake.pet/*",
        "*://stake1001.com/*",
        "*://stake1002.com/*",
        "*://stake1003.com/*",
        "*://stake1021.com/*",
        "*://stake1022.com/*",
        "*://stake.mba/*",
        "*://stake.jp/*",
        "*://stake.bz/*",
        "*://staketr.com/*",
        "*://stake.ceo/*",
        "*://stake.krd/*"
      ],
      "js": [
        "contentPreload.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://stake.com/*",
        "*://stake.ac/*",
        "*://stake.games/*",
        "*://stake.bet/*",
        "*://stake.pet/*",
        "*://stake1001.com/*",
        "*://stake1002.com/*",
        "*://stake1003.com/*",
        "*://stake1021.com/*",
        "*://stake1022.com/*",
        "*://stake.mba/*",
        "*://stake.jp/*",
        "*://stake.bz/*",
        "*://staketr.com/*",
        "*://stake.ceo/*",
        "*://stake.krd/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "png/*.png",
        "icons/crypto/*.png",
        "qrcode.min.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "commands": {
    "open-extension-popup": {
      "suggested_key": {
        "default": "Ctrl+Shift+K",
        "mac": "Command+Shift+K"
      },
      "description": "Open the Casino Theme Customizer popup"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "samixval@gmail.com",
      "strict_min_version": "109.0"
    }
  }
}