Examine source code of Melancholic Y2K

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Melancholic Y2K",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(45, 113, 168, 0.68)",
      "toolbar_text": "rgb(230, 217, 251)",
      "frame": "rgb(154, 99, 168)",
      "tab_background_text": "rgb(243, 227, 247)",
      "toolbar_field": "rgb(238, 238, 238)",
      "toolbar_field_text": "rgb(114, 90, 159)",
      "tab_line": "rgb(239, 185, 251)",
      "popup": "rgb(232, 223, 235)",
      "popup_text": "rgb(135, 93, 213)",
      "button_background_active": "rgb(149, 113, 215)",
      "button_background_hover": "rgba(172, 127, 217, 0.5)",
      "icons": "rgb(207, 187, 243)",
      "ntp_background": "rgb(245, 234, 249)",
      "popup_border": "rgb(83, 8, 223)",
      "tab_loading": "rgb(239, 185, 251)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{18b48dfe-dd10-4f2a-9fc2-65b0f32a234a}"
    }
  }
}