Examine source code of dark octo violet

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "dark octo violet",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(86, 10, 131, 0.66)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(1, 36, 43)",
      "tab_background_text": "rgb(140, 140, 140)",
      "toolbar_field": "rgb(49, 49, 49)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(120, 60, 157)",
      "popup": "rgb(27, 40, 45)",
      "popup_text": "rgb(227, 192, 249)",
      "button_background_active": "rgb(121, 33, 198)",
      "button_background_hover": "rgb(121, 33, 198)",
      "frame_inactive": "rgb(0, 0, 0)",
      "icons_attention": "rgb(255, 119, 0)",
      "icons": "rgb(227, 192, 249)",
      "popup_border": "rgb(121, 33, 198)",
      "sidebar_highlight_text": "rgb(255, 255, 255)",
      "tab_background_separator": "rgb(227, 192, 249)",
      "tab_loading": "rgb(255, 255, 255)",
      "tab_selected": "rgb(120, 60, 157)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgb(0, 16, 19)",
      "toolbar_field_border": "rgb(227, 192, 249)",
      "toolbar_vertical_separator": "rgb(227, 192, 249)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ee3eebdf-f293-4c71-bece-b457232aab1d}"
    }
  }
}