Examine source code of Crystal

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Crystal ",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-037-b73f9b34467ba541de861f5b4c0c6316.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(10, 195, 207)",
      "toolbar_text": "rgb(103, 11, 5)",
      "frame": "rgb(12, 218, 231)",
      "tab_background_text": "rgb(103, 11, 5)",
      "toolbar_field": "rgb(12, 218, 231)",
      "toolbar_field_text": "rgb(103, 11, 5)",
      "tab_line": "rgb(103, 11, 5)",
      "popup": "rgb(12, 218, 231)",
      "popup_text": "rgb(103, 11, 5)",
      "tab_loading": "rgb(103, 11, 5)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9c13826a-7d7e-48bb-93a2-51bd75fc8314}"
    }
  }
}