Examine source code of simple thema

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "my thema",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-045-3e6898966e6ccdc87f80d23d4e7a6a49.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(225, 234, 239)",
      "toolbar_text": "rgb(1, 105, 155)",
      "frame": "rgb(225, 234, 239)",
      "tab_background_text": "rgb(133, 176, 196)",
      "toolbar_field": "rgb(229, 236, 241)",
      "toolbar_field_text": "rgb(1, 105, 155)",
      "tab_line": "rgb(219, 229, 234)",
      "popup": "rgba(81, 133, 168, 0.73)",
      "popup_text": "rgb(255, 255, 255)",
      "toolbar_field_border_focus": "rgb(225, 234, 239)",
      "toolbar_field_border": "rgb(225, 234, 239)",
      "tab_loading": "rgb(219, 229, 234)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a6f1f150-1d63-41ec-a17b-775126fcd3ad}"
    }
  }
}