Examine source code of Smol Yuuka

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Smol Yuuka",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(54, 54, 60)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(18, 18, 21)",
      "tab_background_text": "rgb(109, 129, 150)",
      "toolbar_field": "rgb(44, 44, 45)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(56, 60, 62)",
      "popup": "rgb(31, 34, 61)",
      "popup_text": "rgb(215, 226, 239)",
      "tab_loading": "rgb(56, 60, 62)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6493734b-a416-4529-ab36-6a491076a9ad}"
    }
  }
}