Examine source code of Copper Vein II

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Copper Vein II",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(128, 140, 128)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(60, 68, 63)",
      "tab_background_text": "rgb(141, 150, 135)",
      "toolbar_field": "rgba(229, 237, 226, 0.75)",
      "toolbar_field_text": "rgb(53, 79, 49)",
      "tab_line": "rgb(128, 140, 128)",
      "popup": "rgb(230, 230, 230)",
      "popup_text": "rgb(23, 23, 23)",
      "icons": "rgba(18, 66, 43, 0.8)",
      "tab_selected": "rgb(128, 140, 128)",
      "tab_text": "rgb(11, 28, 20)",
      "toolbar_bottom_separator": "rgb(128, 140, 128)",
      "toolbar_field_border_focus": "rgb(187, 236, 152)",
      "toolbar_field_border": "rgb(128, 140, 128)",
      "toolbar_field_focus": "rgba(225, 240, 197, 0.8)",
      "toolbar_field_highlight": "rgb(156, 177, 110)",
      "toolbar_top_separator": "rgb(128, 140, 128)",
      "tab_loading": "rgb(128, 140, 128)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6939690b-ae58-47b4-b374-a20e22b475e4}"
    }
  }
}