Examine source code of Black red shards

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Black red shards",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 255, 255, 0)",
      "toolbar_text": "rgb(255, 0, 6)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 0, 8)",
      "toolbar_field": "rgba(42, 42, 42, 0.8)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 0, 6)",
      "popup": "rgb(29, 29, 29)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_hover": "rgb(45, 45, 45)",
      "icons_attention": "rgb(255, 0, 7)",
      "icons": "rgb(255, 0, 7)",
      "popup_border": "rgb(255, 255, 255)",
      "tab_background_separator": "rgb(255, 0, 7)",
      "tab_loading": "rgb(255, 255, 255)",
      "tab_selected": "rgb(37, 37, 37)",
      "tab_text": "rgb(255, 0, 7)",
      "toolbar_field_border_focus": "rgb(255, 0, 7)",
      "toolbar_top_separator": "rgba(255, 255, 255, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{43f082d4-c704-403c-b71c-8a620fb5e286}"
    }
  }
}