Examine source code of stayux-simplegray

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "stayux-simplegray",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(54, 54, 54)",
      "toolbar_text": "rgb(202, 202, 202)",
      "frame": "rgb(54, 54, 54)",
      "tab_background_text": "rgb(150, 150, 150)",
      "toolbar_field": "rgb(37, 37, 37)",
      "toolbar_field_text": "rgb(225, 225, 225)",
      "tab_line": "rgb(150, 150, 150)",
      "popup": "rgba(37, 37, 37, 0.95)",
      "popup_text": "rgb(148, 148, 148)",
      "button_background_hover": "rgb(77, 77, 77)",
      "icons_attention": "rgb(77, 77, 77)",
      "popup_border": "rgb(54, 54, 54)",
      "popup_highlight_text": "rgb(225, 225, 225)",
      "popup_highlight": "rgb(77, 77, 77)",
      "sidebar_highlight": "rgb(37, 37, 37)",
      "sidebar_text": "rgb(150, 150, 150)",
      "sidebar": "rgb(37, 37, 37)",
      "tab_loading": "rgba(134, 134, 134, 0.41)",
      "tab_selected": "rgba(134, 134, 134, 0.41)",
      "tab_text": "rgb(202, 202, 202)",
      "toolbar_bottom_separator": "rgb(54, 54, 54)",
      "toolbar_field_border_focus": "rgb(37, 37, 37)",
      "toolbar_field_border": "rgb(37, 37, 37)",
      "toolbar_field_focus": "rgba(37, 37, 37, 0.99)",
      "toolbar_field_highlight_text": "rgba(202, 202, 205, 0.41)",
      "toolbar_field_highlight": "rgba(134, 134, 134, 0.41)",
      "toolbar_field_separator": "rgba(202, 202, 205, 0.41)",
      "toolbar_field_text_focus": "rgba(202, 202, 205, 0.41)",
      "toolbar_top_separator": "rgb(54, 54, 54)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{00e17fb1-8097-45b8-a7b7-201dbffffb77}"
    }
  }
}