Examine source code of Neutral Dark Gray Theme

{
  "manifest_version": 2,
  "version": "1.2",
  "name": "Neutral Dark Gray Theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(48, 48, 48)",
      "toolbar_text": "rgb(230, 230, 230)",
      "frame": "rgb(25, 25, 25)",
      "tab_background_text": "rgb(130, 130, 130)",
      "toolbar_field": "rgb(25, 25, 25)",
      "toolbar_field_text": "rgb(218, 218, 218)",
      "tab_line": "rgb(48, 48, 48)",
      "popup": "rgb(48, 48, 48)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(80, 80, 80)",
      "button_background_hover": "rgb(66, 66, 66)",
      "frame_inactive": "rgb(36, 36, 36)",
      "ntp_background": "rgb(35, 35, 35)",
      "sidebar": "rgb(48, 48, 48)",
      "tab_loading": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgb(48, 48, 48)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1020c54e-f2f9-4d7c-9788-6e4dfcc8e252}"
    }
  }
}