Examine source code of Modern Simple Dark

{
  "manifest_version": 2,
  "version": "1.0.1",
  "name": "Modern Dark",
  "theme": {
    "colors": {
      "toolbar": "rgb(36, 36, 36)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(16, 16, 16)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(54, 54, 54)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(0, 124, 255, 0)",
      "popup": "rgb(54, 54, 54)",
      "popup_text": "rgb(255, 255, 255)",
      "frame_inactive": "rgb(0, 0, 0)",
      "toolbar_top_separator": "rgb(53, 53, 53)",
      "tab_loading": "rgba(0, 124, 255, 0)",
      "ntp_card_background": "rgb(54, 54, 54)",
      "ntp_text": "white"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cedecf12-2251-4902-99a7-e61661bb407c}"
    }
  }
}