Examine source code of sunshine-dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "sunshine-dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-022-0e8aa16bfcfce2449791412d89f3a92b.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(22, 22, 22)",
      "toolbar_text": "rgb(255, 240, 8)",
      "frame": "rgb(78, 78, 79)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(16, 16, 15)",
      "toolbar_field_text": "rgb(255, 240, 0)",
      "tab_line": "rgb(255, 240, 8)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(255, 240, 0)",
      "sidebar": "rgb(5, 5, 5)",
      "toolbar_vertical_separator": "rgb(43, 0, 255)",
      "tab_loading": "rgb(255, 240, 8)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{01299c18-36ff-42e9-9b4a-8d3eecf84479}"
    }
  }
}