Examine source code of Lime Dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Lime Dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-036-40a272fe657f748396e017c7a64ee2dc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(67, 67, 67)",
      "toolbar_text": "rgb(0, 172, 115)",
      "frame": "rgb(26, 26, 26)",
      "tab_background_text": "rgb(0, 255, 168)",
      "toolbar_field": "rgb(37, 37, 37)",
      "toolbar_field_text": "rgb(0, 255, 168)",
      "tab_line": "rgb(187, 187, 187)",
      "popup": "rgb(47, 47, 47)",
      "popup_text": "rgb(0, 255, 169)",
      "tab_loading": "rgb(187, 187, 187)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6aa407be-2614-41c0-8524-9f0e45cba6bb}"
    }
  }
}