Examine source code of Dark bluish gray

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark bluish gray",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(35, 34, 43)",
      "toolbar_text": "rgb(162, 161, 166)",
      "frame": "rgb(28, 27, 34)",
      "tab_background_text": "rgb(162, 161, 166)",
      "toolbar_field": "rgb(35, 34, 43)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(66, 66, 77)",
      "popup": "rgb(35, 34, 43)",
      "popup_text": "rgb(162, 161, 166)",
      "button_background_active": "rgb(66, 66, 77)",
      "button_background_hover": "rgb(64, 76, 98)",
      "icons_attention": "rgb(0, 221, 255)",
      "icons": "rgb(162, 161, 166)",
      "ntp_background": "rgb(28, 27, 34)",
      "ntp_text": "rgb(181, 211, 255)",
      "popup_border": "rgb(66, 66, 77)",
      "tab_selected": "rgb(28, 27, 34)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgb(35, 34, 43)",
      "toolbar_field_border_focus": "rgb(56, 56, 61)",
      "toolbar_field_border": "rgb(66, 66, 77)",
      "toolbar_field_focus": "rgb(28, 27, 34)",
      "toolbar_field_highlight_text": "rgb(0, 0, 0)",
      "toolbar_field_highlight": "rgb(8, 161, 242)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgb(35, 34, 43)",
      "tab_loading": "rgb(66, 66, 77)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5fdac5e5-ddfd-47a4-84af-5e9bb623085c}"
    }
  }
}