This code comes from an externally managed library, available at
<https://github.com/mathiasbynens/jsesc>. Bugs should be reported directly
upstream and integrated back here.

In order to regenerate this file, you need to do the following:

  $ git clone git@github.com:mathiasbynens/jsesc.git && cd jsesc
  $ grunt template
  $ export MOZ_JSESC="../mozilla-central/toolkit/modules/third_party/jsesc"
  $ cat $MOZ_JSESC/fx-header jsesc.js $MOZ_JSESC/fx-footer > $MOZ_JSESC/jsesc.mjs

You will then need to change the penulitmate line from `}(this));` to `}(global));`