Examine source code of Material SubBlack Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Material SubBlack Theme",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(18, 18, 18)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(18, 18, 18)",
      "tab_background_text": "rgb(170, 170, 170)",
      "toolbar_field": "rgb(21, 21, 21)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(48, 48, 48)",
      "popup": "rgb(18, 18, 18)",
      "popup_text": "rgb(255, 255, 255)",
      "ntp_background": "rgb(18, 18, 18)",
      "popup_border": "rgb(48, 48, 48)",
      "popup_highlight": "rgb(48, 48, 48)",
      "tab_selected": "rgb(21, 21, 21)",
      "toolbar_bottom_separator": "rgb(18, 18, 18)",
      "toolbar_field_border_focus": "rgb(48, 48, 48)",
      "toolbar_field_border": "rgb(18, 18, 18)",
      "toolbar_field_separator": "rgb(18, 18, 18)",
      "toolbar_top_separator": "rgb(18, 18, 18)",
      "tab_loading": "rgb(48, 48, 48)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a4f6e657-cbb5-47bd-bb44-e68c7863f7d4}"
    }
  }
}