Examine source code of Black Transparent

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark Gray",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(7, 7, 7)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(181, 181, 181)",
      "toolbar_field": "rgb(23, 23, 23)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgba(0, 0, 0, 0.85)",
      "popup_text": "rgb(255, 255, 255)",
      "icons": "rgb(255, 255, 255)",
      "ntp_background": "rgb(0, 0, 0)",
      "sidebar_border": "rgba(0, 0, 0, 0.5)",
      "sidebar_highlight_text": "rgb(255, 255, 255)",
      "sidebar_highlight": "rgba(255, 255, 255, 0.5)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(0, 0, 0)",
      "tab_selected": "rgba(255, 255, 255, 0.05)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_field_border_focus": "rgba(255, 255, 255, 0.1)",
      "toolbar_field_border": "rgba(55, 55, 55, 0.48)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "toolbar_vertical_separator": "rgb(153, 153, 153)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f5a4aa72-f506-4139-a0ee-4ff59b76ff0d}"
    }
  }
}