Examine source code of Space Travel (Green)

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Space Travel (Green)",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-026-829b05416f823e170310e7c826ad1bec.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(20, 22, 20)",
      "toolbar_text": "rgb(38, 102, 73)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(67, 218, 104)",
      "toolbar_field": "rgb(38, 102, 73)",
      "toolbar_field_text": "rgb(59, 253, 101)",
      "tab_line": "rgb(38, 102, 73)",
      "popup": "rgb(102, 227, 95)",
      "popup_text": "rgb(38, 102, 73)",
      "tab_selected": "rgb(102, 227, 95)",
      "tab_loading": "rgb(38, 102, 73)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4600d930-3daa-46d3-ab76-420c621a9f3b}"
    }
  }
}