Download |top| Javascript For Firefox Guide

You do not need to separately, as it is already built directly into the browser . All modern versions of Firefox use the SpiderMonkey engine to execute JavaScript automatically, allowing you to experience interactive websites without any additional installation. How to Enable JavaScript in Firefox

If you are receiving a message that "JavaScript is disabled," it is likely turned off in your advanced settings or blocked by an extension. You can re-enable it using the following steps: download javascript for firefox