Source maps are files that tell browsers or other tools that consume CSS how
that CSS corresponds to the Sass files from which it was generated. They make it
possible to see and even edit your Sass files in browsers. See instructions for
using source maps in [Chrome][] and [Firefox][].

[Chrome]: https://developers.google.com/web/tools/chrome-devtools/javascript/source-maps
[Firefox]: https://developer.mozilla.org/en-US/docs/Tools/Style_Editor#Source_map_support