Can you please give a detailed desciption on how to use install the firefox plugin and then what to do.
Just open the Tools->Add-Ons menu in Firefox.
Click on Get Add-ons in the upper left of the window that pops up.
Search for "NoScript". Once you find it, click the Add to Firefox button.
Once you start using it, you must enable the domains you want to run scripts (either temporary or permanently).
There will be an icon in the bottom of Firefox that looks like an blue S with a smaller red circle/slash over the bottom of the S. Right-click that icon to enable or disable scripts from the domain(s) you are currently viewing.