Options Window: Miscellaneous (JavaScript Tab)
To access the Options window, select from the main menu: Tools > Options (Windows® and Linux®)
mplab_ide > Preferences (macOS®)

Tools-Options-Misc-Javascript.png

The JavaScript tab of the Miscellaneous category contains settings that are a hold-over from Oracle's NetBeans IDE, upon which MPLAB® X IDE is based. These settings have no effect in MPLAB X IDE.