Examine source code of Good enough

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Good enough",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-017-7074520d97b5c592d413aed5f115f093.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(137, 32, 29)",
      "toolbar_text": "rgb(222, 217, 177)",
      "frame": "rgb(31, 27, 24)",
      "tab_background_text": "rgb(174, 132, 82)",
      "toolbar_field": "rgb(37, 68, 50)",
      "toolbar_field_text": "rgb(222, 217, 177)",
      "tab_line": "rgb(174, 132, 82)",
      "popup": "rgb(37, 68, 50)",
      "popup_text": "rgb(222, 217, 177)",
      "tab_loading": "rgb(174, 132, 82)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{36c77ef9-ed0b-4eac-b457-388937f767b0}"
    }
  }
}