McAfee ScriptScan has been blocked for your protection.

Why was it blocked?
This add-on causes a high volume of crashes.
Who is affected?
Users of McAfee ScriptScan versions 14.4.0 and below for all versions of Firefox and SeaMonkey.
What does this mean?

Users are strongly encouraged to disable the problematic add-on or plugin, but may choose to continue using it if they accept the risks described.

When Mozilla becomes aware of add-ons, plugins, or other third-party software that seriously compromises Firefox security, stability, or performance and meets certain criteria, the software may be blocked from general use. For more information, please read this support article.