Examine source code of Aspen Rust

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Aspen Rust",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(80, 62, 26)",
      "toolbar_text": "rgb(254, 237, 211)",
      "frame": "rgb(38, 40, 26)",
      "tab_background_text": "rgb(78, 135, 135)",
      "toolbar_field": "rgb(118, 83, 32)",
      "toolbar_field_text": "rgb(254, 237, 211)",
      "tab_line": "rgb(226, 159, 68)",
      "popup": "rgb(80, 62, 26)",
      "popup_text": "rgb(254, 237, 211)",
      "button_background_hover": "rgb(54, 64, 53)",
      "icons_attention": "rgb(78, 135, 135)",
      "popup_border": "rgb(226, 159, 68)",
      "tab_text": "rgb(226, 159, 68)",
      "toolbar_field_border_focus": "rgba(174, 102, 3, 0)",
      "tab_loading": "rgb(226, 159, 68)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f3ccd247-513f-4cd1-85bb-4a0e37206190}"
    }
  }
}