Examine source code of Dark Blue

{
  "manifest_version": 2,
  "version": "4.0",
  "name": "Dark Blue",
  "theme": {
    "colors": {
      "frame": "rgb(25, 25, 25)",
      "toolbar": "rgb(35, 35, 35)",
      "toolbar_text": "rgb(250, 250, 250)",
      "tab_background_text": "rgb(190, 190, 190)",
      "toolbar_field": "rgb(60, 60, 60)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "toolbar_field_border_focus": "rgb(66, 152, 185)",
      "tab_line": "rgb(66, 152, 185)",
      "tab_selected": "rgb(66, 152, 185)",
      "tab_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(66, 152, 185)",
      "button_background_hover": "rgb(66, 152, 185)",
      "button_background_active": "rgb(66, 152, 185)",
      "icons_attention": "rgb(246, 202, 14)",
      "popup": "rgb(40, 40, 40)",
      "popup_text": "rgb(250, 250, 250)",
      "popup_highlight": "rgb(66, 152, 185)",
      "popup_highlight_text": "rgb(255, 255, 255)",
      "popup_border": "rgb(70, 70, 70)",
      "sidebar": "rgb(35, 35, 35)",
      "sidebar_highlight": "rgb(66, 152, 185)",
      "sidebar_highlight_text": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9543958f-6b48-4b3e-b9a0-4616ebd499f6}"
    }
  }
}