Examine source code of Metal Compilation

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "checker-plate-01",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(41, 41, 41, 0.65)",
      "toolbar_text": "rgb(204, 204, 204)",
      "frame": "rgb(21, 21, 21)",
      "tab_background_text": "rgb(200, 200, 200)",
      "toolbar_field": "rgb(38, 38, 38)",
      "toolbar_field_text": "rgb(225, 225, 225)",
      "tab_line": "rgba(115, 115, 115, 0)",
      "popup": "rgb(64, 64, 64)",
      "popup_text": "rgb(225, 225, 225)",
      "button_background_active": "rgba(68, 68, 68, 0.76)",
      "button_background_hover": "rgba(149, 149, 149, 0.47)",
      "icons_attention": "rgba(229, 124, 24, 0.94)",
      "icons": "rgb(225, 225, 225)",
      "ntp_text": "rgba(225, 225, 225, 0.85)",
      "popup_border": "rgba(225, 225, 225, 0)",
      "popup_highlight_text": "rgb(225, 225, 225)",
      "popup_highlight": "rgba(229, 124, 24, 0.72)",
      "sidebar_border": "rgba(225, 225, 225, 0)",
      "sidebar_highlight_text": "rgb(255, 255, 255)",
      "sidebar_highlight": "rgba(229, 124, 24, 0.62)",
      "sidebar_text": "rgb(225, 225, 225)",
      "sidebar": "rgb(64, 64, 64)",
      "tab_loading": "rgba(229, 124, 24, 0.75)",
      "tab_selected": "rgba(100, 100, 100, 0.67)",
      "tab_text": "rgb(208, 208, 208)",
      "toolbar_bottom_separator": "rgb(41, 41, 41)",
      "toolbar_field_border_focus": "rgba(162, 85, 225, 0)",
      "toolbar_field_border": "rgba(115, 115, 115, 0)",
      "toolbar_field_focus": "rgb(48, 48, 48)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgba(227, 122, 22, 0.87)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgba(0, 0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4f8b418d-a10c-49f5-9bce-c0c42ebb632a}"
    }
  }
}