Examine source code of Black and Yellow

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Black and Yellow",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-036-40a272fe657f748396e017c7a64ee2dc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(42, 42, 43)",
      "toolbar_text": "rgb(247, 255, 0)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(247, 255, 0)",
      "toolbar_field": "rgb(42, 42, 43)",
      "toolbar_field_text": "rgb(247, 255, 0)",
      "tab_line": "rgb(247, 255, 0)",
      "popup": "rgb(42, 42, 43)",
      "popup_text": "rgb(247, 255, 0)",
      "ntp_background": "rgb(42, 42, 43)",
      "ntp_text": "rgb(247, 255, 0)",
      "popup_border": "rgb(247, 255, 0)",
      "popup_highlight_text": "rgb(247, 255, 0)",
      "sidebar_border": "rgb(247, 255, 0)",
      "sidebar_highlight_text": "rgb(247, 255, 0)",
      "sidebar_text": "rgb(247, 255, 0)",
      "sidebar": "rgb(42, 42, 43)",
      "tab_selected": "rgb(42, 42, 43)",
      "toolbar_bottom_separator": "rgb(247, 255, 0)",
      "toolbar_field_border_focus": "rgb(247, 255, 0)",
      "toolbar_field_border": "rgb(247, 255, 0)",
      "toolbar_field_highlight_text": "rgb(0, 0, 0)",
      "toolbar_field_separator": "rgb(247, 255, 0)",
      "toolbar_vertical_separator": "rgb(247, 255, 0)",
      "tab_loading": "rgb(247, 255, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5d7fd9d1-4913-4a04-b9a8-d359925f3f1f}"
    }
  }
}