Examine source code of sunset dark forest theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "dark forest",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(62, 68, 57)",
      "toolbar_text": "rgb(233, 226, 200)",
      "frame": "rgb(67, 72, 61)",
      "tab_background_text": "rgb(240, 222, 172)",
      "toolbar_field": "rgb(86, 90, 65)",
      "toolbar_field_text": "rgb(255, 237, 166)",
      "tab_line": "rgb(207, 215, 160)",
      "popup": "rgb(227, 229, 184)",
      "popup_text": "rgb(91, 106, 108)",
      "tab_loading": "rgb(207, 215, 160)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{14f01698-5b67-405c-bddf-585efecff23e}"
    }
  }
}