Examine source code of metal brush graphite

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "metal brush graphite",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(247, 253, 251, 0.35)",
      "toolbar_text": "rgb(74, 74, 74)",
      "frame": "rgb(105, 105, 105)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(0, 0, 0)",
      "popup": "rgb(193, 193, 193)",
      "popup_text": "rgb(0, 0, 0)",
      "button_background_active": "rgb(159, 159, 159)",
      "button_background_hover": "rgb(159, 159, 159)",
      "icons": "rgba(0, 0, 0, 0.62)",
      "tab_selected": "rgba(255, 255, 255, 0.27)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgb(159, 159, 159)",
      "toolbar_vertical_separator": "rgba(247, 253, 251, 0.35)",
      "tab_loading": "rgb(0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d3c25124-b929-43a2-9100-4ad9af115314}"
    }
  }
}