Examine source code of Yae Miko

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Yae Miko",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(253, 230, 255, 0.2)",
      "toolbar_text": "rgb(185, 17, 223)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(185, 17, 223)",
      "toolbar_field": "rgb(242, 195, 255)",
      "toolbar_field_text": "rgb(185, 17, 223)",
      "tab_line": "rgb(228, 114, 255)",
      "popup": "rgb(243, 244, 247)",
      "popup_text": "rgb(185, 17, 223)",
      "tab_loading": "rgb(228, 114, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{43e2100c-89b6-4cd1-87e8-b809ad8f5b98}"
    }
  }
}