Examine source code of Riding Pick New Tab

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Iranian Architecture Symmetry",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(144, 127, 17)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(190, 188, 62)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(230, 143, 84, 0.75)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(175, 46, 215)",
      "popup": "rgb(216, 160, 68)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(175, 46, 215)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6eaf2372-5a25-4b5c-947e-1766e4a21985}"
    }
  }
}