Sometimes you need to disable JavaScript for development or security purposes. Just as you can disable JavaScript in Chrome and other browsers, you can also disable JavaScript in Firefox for Windows, Mac, Linux, and Android.

Disabling JavaScript in Firefox should only take a few minutes, even if you’re not familiar with using Firefox’s settings. Before you begin, make sure you’ve updated Firefox to the latest version.

Enter about:config into Firefox's URL bar.

Select the blue 'Accept the risk and continue' button.