Javascript is not activated

In Firefox

Click on the top menu bar Edit / Preferences . Here you can activate javascript by selecting Content and activate Javascript and confirm with OK.

In Internet Explorer

Top right, click the wrench icon and select Options.Click on the Details in content settings and enable the execution of Javascript.

In Google Chrome

Click on the top menu bar, click Tools / Internet Options. Then click on either security to default level, or choose Custom Level and then activate Enable Active Scripting in the Scripting section. Confirm with OK.