Silverlight for Mac OS X is Blocked in Firefox KBA3755
If Silverlight for Mac OS X is not updated, Firefox may block it. When this happens, Silverlight cannot run again unless it is manually enabled. It may even be necessary to manually enable Silverlight after updating it to the current version.
To resolve this, navigate to the Firefox Add-ons Manager and click the Enable button next to Microsoft Silverlight.
If Firefox is disabled it is possible to get stuck in a loop where you will be prompted to install Silverlight, which will install successfully, and then you will again be prompted to install it because it is disabled and therefore not available to the browser.
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