How to activate Javascript in various browsers? How to activate JavaScript for Microsoft Internet Explorer 1. On the Tools dropdown menu, click Internet Options, and then click the Security tab. 2. Click on the earth «Internet» icon, and then the Custom Level button. 3. Scroll to the bottom of the Settings list, and locate the section named Scripting. 4. Under the subsection Active Scripting, click Enable. Click OK. 5. Answer Yes to the confirm box that pops up. Click OK. 6. Click the «Back» button at the top of your browser window, and then click «Refresh». How to activate JavaScript for Mozilla Firefox 1. Go to the «Tools» drop-down menu and click on «Options…». 2. In the toolbar at the top, click on the globe icon «Content». 3. Click the «Enable Javascript» option, and then click OK. 4. Click the Circling blue arrow button «Reload» at the top of your browser window.