Examine source code of Dark Theme (Grey)

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark Grey",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(59, 60, 59)",
      "toolbar_text": "rgb(157, 214, 59)",
      "frame": "rgb(7, 7, 7)",
      "tab_background_text": "rgb(218, 218, 16)",
      "toolbar_field": "rgba(167, 170, 163, 0.7)",
      "toolbar_field_text": "rgb(255, 255, 36)",
      "tab_line": "rgb(255, 44, 2)",
      "popup": "rgb(79, 112, 79)",
      "popup_text": "rgb(249, 249, 6)",
      "button_background_active": "rgb(249, 249, 6)",
      "button_background_hover": "rgb(7, 176, 238)",
      "frame_inactive": "rgb(255, 44, 2)",
      "icons_attention": "rgb(255, 44, 2)",
      "ntp_background": "rgb(113, 117, 115)",
      "ntp_text": "rgb(244, 244, 0)",
      "popup_border": "rgb(11, 241, 147)",
      "popup_highlight": "rgb(255, 44, 2)",
      "sidebar_border": "rgb(16, 218, 136)",
      "sidebar_highlight_text": "rgb(255, 44, 2)",
      "tab_loading": "rgb(255, 44, 2)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d3552678-4315-4eee-9cd9-55aaee264e2f}"
    }
  }
}