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Silverlight has stopped working in Firefox 12.0 but works fine in Safari. Have uninstalled and reinstalled but this didn't fix it.

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Silverlight has stopped working in Firefox 12.0 but works fine in Safari. Have uninstalled and reinstalled but this didn't fix it. I also tried the font fix with Arial and Verdana but this didn't fix either.

Would appreciate any help.

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Did it stop when you upgraded to Firefox 12, or did it stop independently of a Firefox upgrade? In any case, you should upgrade to Firefox 13 as a first step -- this might have already been fixed.

Is the plugin actually loaded/enabled? This article walks you through installing, setting up, and verifying that Silverlight is working: https://support.mozilla.org/en-US/kb/Using%20the%20Silverlight%20plugin%20with%20Firefox