Examine source code of slimetheme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "slime",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png",
        "images/1.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top",
        "left bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat",
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(167, 94, 221, 0.35)",
      "toolbar_text": "rgb(235, 204, 243)",
      "frame": "rgb(126, 29, 153)",
      "tab_background_text": "rgb(195, 159, 213)",
      "toolbar_field": "rgba(209, 170, 209, 0.18)",
      "toolbar_field_text": "rgb(249, 243, 251)",
      "tab_line": "rgb(168, 16, 221)",
      "popup": "rgb(206, 147, 232)",
      "popup_text": "rgb(137, 41, 218)",
      "tab_loading": "rgb(168, 16, 221)"
    }
  }
}