Examine source code of Gray-Rust Pattern

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Gray-Rust Pattern",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(223, 223, 223)",
      "toolbar_text": "rgba(0, 0, 0, 0.7)",
      "frame": "rgb(102, 102, 102)",
      "tab_background_text": "rgb(211, 211, 211)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgba(255, 255, 255, 0.2)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(0, 0, 0)",
      "button_background_active": "rgba(189, 122, 77, 0.3)",
      "button_background_hover": "rgba(189, 122, 77, 0.2)",
      "icons_attention": "rgb(189, 122, 77)",
      "popup_border": "rgba(0, 0, 0, 0.2)",
      "popup_highlight_text": "rgb(189, 122, 77)",
      "popup_highlight": "rgba(189, 122, 77, 0.3)",
      "sidebar_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(0, 255, 112)",
      "tab_selected": "rgba(0, 0, 0, 0.5)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgb(191, 191, 191)",
      "toolbar_field_border_focus": "rgb(189, 122, 77)",
      "toolbar_field_border": "rgba(0, 0, 0, 0.25)",
      "toolbar_field_focus": "rgba(255, 255, 255, 0.97)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgb(189, 122, 77)",
      "toolbar_top_separator": "rgba(83, 83, 83, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dec0938a-bb69-4582-9011-86ae303366c7}"
    }
  }
}