What should I do when encounter Javascript Messages at SMS Index Page?

When you are using Firefox browser to access SMS and encountering Javascript message in Notice Board/ Announcement area at the Index Page as shown below.

This Javascript message is shown because you have not enable Javascript for Firefox browser yet.
In order to enable javascript for Firefox, go to Tools ~> Options… at the browser menu. Options windows will pop out, select the Content tab and tick the Enable Javascript checkbox. Click “OK” button to save the options and refresh the page.