Examine source code of Epic Pure Dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Pure Black",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(140, 140, 249)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(31, 31, 31)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(0, 0, 0)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(0, 0, 0)",
      "popup_border": "rgb(41, 41, 41)",
      "popup_highlight_text": "rgb(140, 140, 249)",
      "popup_highlight": "rgb(0, 0, 0)",
      "tab_selected": "rgb(41, 41, 41)",
      "tab_text": "rgb(140, 140, 249)",
      "toolbar_field_border_focus": "rgb(140, 140, 249)",
      "toolbar_field_focus": "rgb(0, 0, 0)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "tab_loading": "rgb(0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{47b250f8-3086-4f70-a8f8-3bfa80845a32}"
    }
  }
}