Your security add-on might need to be updated. Often they are limited to working with specific versions of Firefox. If you check the Add-ons page, can you find it? Either: * Ctrl+Shift+a * "3-bar" menu button (or Tools menu) > Add-ons In the left column, click Extensions. Then, scroll down, as the disabled extensions cluster at the bottom. Now... there is a "Check for Updates" feature on this page, above the list, when you click the "gear" icon. However, for paid software, you generally need to use the software's built-in updater to get the latest add-ons. Any luck tracking it down?