Nit: this line should be indented to eight columns instead of two.

Also, the Mozilla convention (from its [Coding Style Guide](https://developer.mozilla.org/En/Mozilla_Coding_Style_Guide) and usage in this script and elsewhere) is to put a character of space around operators like the plus sign and the equivalence operator as well as before/after opening/closing  parentheses.

Finally, since the *environment* array is defined on a single line, it shouldn't include a trailing comma, which is only helpful when an array definition stretches across multiple lines, with one item per line (since that makes it possible to add an item without modifying the line of the last item).