Examine source code of Matcha-Milk

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Matcha",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(208, 201, 192)",
      "toolbar_text": "rgb(95, 113, 97)",
      "frame": "rgb(239, 234, 216)",
      "tab_background_text": "rgb(83, 67, 64)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(95, 113, 97)",
      "tab_line": "rgb(109, 139, 116)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(95, 113, 97)",
      "tab_loading": "rgb(109, 139, 116)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a8354bbd-9320-4e85-a793-975fa099bc2c}"
    }
  }
}