Examine source code of Mystery Meat

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Mystery Meat",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgba(31, 34, 61, 0.08)",
      "toolbar_text": "rgba(255, 255, 255, 0.85)",
      "frame": "rgb(8, 11, 33)",
      "tab_background_text": "rgb(215, 226, 239)",
      "toolbar_field": "rgba(54, 62, 89, 0.74)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(182, 35, 205, 0.77)",
      "popup": "rgba(6, 8, 29, 0.78)",
      "popup_text": "rgb(215, 226, 239)",
      "tab_loading": "rgba(182, 35, 205, 0.77)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7acb137c-b338-4432-b0cf-51ec2f8de332}"
    }
  }
}