Google announced Thursday that AMP will support custom JavaScript. The announcement. The AMP Project team posted, “With ‘amp-script’, custom #JS can operate within AMP Documents,” and ...

JavaScript is a programming language that can be embedded in web pages to offer interactive features like sounds, menus, etc. Some browsers support this script while some do not.

Select the "Enable JavaScript" check box to allow scripts on Web pages in Firefox. Click "OK" to save the new settings and close the Options window.