When you save your email template, you see the message: WARNING: The mailing, xxxx, contains JavaScript, which may cause unexpected results when the mailing is viewed. Further, many email clients do not support JavaScript, and mailings containing JavaScript are often flagged as Spam.

This warning occurs when browser plug-ins inject JavaScript into your web page. Two browser plug-ins display this behavior: the Skype plug-in and the Browser Highlighter plug-in. These plug-ins are optionally installed on the browser when you install Skype. Skype itself does not cause problems.

These browser plug-ins are not supported regardless of the browser. It would be best if you uninstalled them to avoid further changes to your templates.