Examine source code of dark logo

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "dark logo",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(15, 209, 240, 0)",
      "toolbar_text": "rgb(112, 130, 248)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(212, 139, 33)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgb(212, 139, 33)",
      "tab_line": "rgb(0, 138, 255)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(212, 139, 33)",
      "button_background_active": "rgba(212, 139, 33, 0.27)",
      "icons_attention": "rgba(212, 139, 33, 0.62)",
      "tab_loading": "rgb(0, 138, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f96c7bc0-d89c-4bf1-b61f-5a4b0de81abc}"
    }
  }
}