Examine source code of Developer Dark Theme

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Developer Dark Theme",
  "theme": {
    "colors": {
      "toolbar": "rgb(13, 17, 23)",
      "toolbar_text": "rgb(230, 237, 243)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(161, 168, 174)",
      "toolbar_field": "rgb(13, 17, 23)",
      "toolbar_field_text": "rgb(230, 237, 243)",
      "tab_line": "rgb(247, 129, 102)",
      "popup": "rgb(13, 17, 23)",
      "popup_text": "rgb(230, 237, 243)",
      "button_background_active": "rgb(31, 111, 235)",
      "frame_inactive": "rgba(13, 17, 23, 0.68)",
      "icons_attention": "rgb(31, 111, 235)",
      "icons": "rgb(230, 237, 243)",
      "ntp_background": "rgb(1, 4, 9)",
      "ntp_card_background": "rgb(13, 17, 23)",
      "ntp_text": "rgb(230, 237, 243)",
      "popup_border": "rgba(48, 54, 61)",
      "sidebar_border": "rgba(48, 54, 61)",
      "sidebar_text": "rgb(230, 237, 243)",
      "sidebar": "rgb(13, 17, 23)",
      "tab_selected": "rgb(23, 27, 32)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_field_border_focus": "rgb(31, 111, 235)",
      "toolbar_field_border": "rgba(48, 54, 61)",
      "toolbar_field_focus": "rgb(13, 17, 23)",
      "toolbar_field_highlight_text": "rgb(230, 237, 243)",
      "toolbar_field_highlight": "rgba(230, 237, 243, 0.45)",
      "toolbar_field_text_focus": "rgb(230, 237, 243)",
      "tab_loading": "rgb(247, 129, 102)",
      "toolbar_bottom_separator": "rgba(48, 54, 61)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{09b1b679-bad6-4418-ac53-460e04e07d35}"
    }
  }
}