Examine source code of Light Bluish Grey

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "toll",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(68, 87, 96)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(43, 55, 61)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(56, 69, 76)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(34, 178, 103, 0)",
      "popup": "rgb(41, 42, 45)",
      "popup_text": "rgb(254, 254, 254)",
      "button_background_active": "rgb(93, 109, 117)",
      "button_background_hover": "rgb(93, 109, 117)",
      "icons": "rgb(255, 255, 255)",
      "tab_loading": "rgb(255, 255, 255)",
      "tab_text": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d02bc064-1ab9-4fdd-a858-3a81486bf4d5}"
    }
  }
}