Examine source code of Petrol-Orange

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "petrol-orange",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-019-7ce748211c61f9059493d4c4378e8a74.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(12, 39, 51)",
      "toolbar_text": "rgb(247, 250, 250)",
      "frame": "rgb(31, 68, 81)",
      "tab_background_text": "rgb(202, 209, 208)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(252, 142, 3)",
      "popup": "rgb(27, 40, 45)",
      "popup_text": "rgb(202, 209, 208)",
      "icons": "rgb(252, 142, 3)",
      "popup_border": "rgb(252, 142, 3)",
      "tab_selected": "rgb(12, 39, 51)",
      "tab_text": "rgb(250, 254, 254)",
      "tab_loading": "rgb(252, 142, 3)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f598580a-d1fb-4afd-a2c1-4085c256fb74}"
    }
  }
}