Examine source code of Normal Light Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Normal Light Theme",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(255, 255, 255)",
      "toolbar_text": "rgb(128, 128, 128)",
      "frame": "rgb(192, 192, 192)",
      "tab_background_text": "rgb(128, 128, 128)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(128, 128, 128)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(0, 0, 0)",
      "button_background_hover": "rgb(192, 192, 192)",
      "icons_attention": "rgb(0, 0, 0)",
      "ntp_background": "rgb(255, 255, 255)",
      "popup_border": "rgb(192, 192, 192)",
      "popup_highlight": "rgb(192, 192, 192)",
      "sidebar_highlight_text": "rgb(192, 192, 192)",
      "sidebar_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(128, 128, 128)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7de8825b-53e5-45a9-87d2-b36a7932bf37}"
    }
  }
}