Examine source code of Techyhub New Tab

{
  "name": "Spiderman Music Listening HD Theme",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "wallpaperflare.com_wallpaper (77).jpg"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(219, 83, 83, 0.78)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(230, 83, 208, 1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d9331398-387f-4ae6-b4e9-e27365e4fe77}"
    }
  }
}