Examine source code of Steel Green

{
  "manifest_version": 2,
  "version": "3.0",
  "name": "Steel Green",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(70, 107, 60, 0.17)",
      "toolbar_text": "rgb(248, 253, 247)",
      "frame": "rgb(162, 190, 157)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(98, 154, 90)",
      "tab_line": "rgb(91, 255, 0)",
      "popup": "rgb(147, 176, 141)",
      "popup_text": "rgb(248, 253, 247)",
      "tab_loading": "rgb(91, 255, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ec6b9636-8cb5-40e5-96eb-fca2e87a057f}"
    }
  }
}