After updating Firefox I started getting the following deprecation warnings:
resource://dactyl/base.jsm:2029: Ary#iterValues is deprecated: Please use Array#values instead.
resource://dactyl/base.jsm:2014: toArray is deprecated: Please use Array.from instead.
resource://dactyl-content/modes.js:312: Ary#iterValues is deprecated: Please use Array#values instead.
resource://dactyl/template.jsm:178: Ary#iterValues is deprecated: Please use Array#values instead.
resource://dactyl-content/mappings.js:318: Ary#iterValues is deprecated: Please use Array#values instead.
After updating Firefox I started getting the following deprecation warnings: