Examine source code of Berserk Guts

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Berserk Guts",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.36)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(255, 0, 4)",
      "tab_background_text": "rgb(161, 161, 161)",
      "toolbar_field": "rgb(45, 45, 45)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 0, 54)",
      "popup": "rgb(56, 56, 56)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(255, 0, 54)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4cd72d9d-52b3-49ea-a005-a992bf2b3311}"
    }
  }
}