Examine source code of Little BRAT

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Little BRAT",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(40, 40, 40)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(40, 40, 40)",
      "tab_background_text": "rgb(201, 201, 201)",
      "toolbar_field": "rgb(40, 40, 40)",
      "toolbar_field_text": "rgb(138, 206, 0)",
      "tab_line": "rgba(255, 255, 255, 0.41)",
      "popup": "rgb(40, 40, 40)",
      "popup_text": "rgba(254, 254, 254, 0.91)",
      "icons_attention": "rgb(77, 0, 253)",
      "icons": "rgb(138, 206, 0)",
      "popup_border": "rgba(90, 90, 90, 0.54)",
      "tab_loading": "rgba(255, 255, 255, 0.41)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a903ed01-66b9-4562-b7f8-4bae3f9c4606}"
    }
  }
}