CloudMask has been blocked for your protection.

Why was it blocked?
These versions of the add-on (before 2.0.788) execute code from a website in a privileged local browser context, potentially allowing dangerous, unreviewed, actions to affect the user's computer. This is fixed in later versions.
Who is affected?
Any user who has version 2.0.788, or earlier, installed.
What does this mean?

The problematic add-on or plugin will be automatically disabled and no longer usable.

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.