Examine source code of Very Good

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Very Good",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-024-8de86d890779309c9a66423c64daa480.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(111, 115, 210)",
      "toolbar_text": "rgb(163, 213, 255)",
      "frame": "rgb(118, 129, 179)",
      "tab_background_text": "rgb(131, 201, 244)",
      "toolbar_field": "rgb(217, 240, 255)",
      "toolbar_field_text": "rgb(111, 115, 210)",
      "tab_line": "rgb(163, 213, 255)",
      "popup": "rgb(217, 240, 255)",
      "popup_text": "rgb(111, 115, 210)",
      "tab_loading": "rgb(163, 213, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b4fa3edf-ffe6-4bb0-822c-accd66da02b9}"
    }
  }
}