Examine source code of Simple Purple-ish

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Simple Purple",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-037-b73f9b34467ba541de861f5b4c0c6316.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(28, 17, 36)",
      "toolbar_text": "rgb(238, 166, 166)",
      "frame": "rgb(79, 61, 86)",
      "tab_background_text": "rgb(238, 166, 166)",
      "toolbar_field": "rgb(47, 40, 75)",
      "toolbar_field_text": "rgb(155, 121, 230)",
      "tab_line": "rgb(248, 112, 140)",
      "popup": "rgb(23, 17, 29)",
      "popup_text": "rgb(115, 93, 159)",
      "tab_loading": "rgb(248, 112, 140)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{16981d9f-6add-47ea-890e-f080497fe6ad}"
    }
  }
}