Examine source code of brown sugar v2

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "brown sugar v2",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-037-b73f9b34467ba541de861f5b4c0c6316.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(89, 37, 12)",
      "toolbar_text": "rgb(242, 204, 173)",
      "frame": "rgb(56, 22, 7)",
      "tab_background_text": "rgb(255, 236, 212)",
      "toolbar_field": "rgb(51, 16, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(242, 204, 173)",
      "popup": "rgb(211, 198, 190)",
      "popup_text": "rgb(89, 37, 12)",
      "tab_loading": "rgb(242, 204, 173)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{86fa7beb-af82-4155-bb5c-23a444a5e84e}"
    }
  }
}