If you get the following pop-up dialog in Firefox go ahead and disable the plug-in and restart your browser. Palemoon is a custom-built and optimized for Windows Firefox derivative that I am testing.
If you do not want to wait for the popup, you can find out if this is installed in Firefox by going to the Firefox menu Tools —> Add-ons, and selecting the Plugins tab. Disable by clicking on the Disable button it is in the Plugins list.
You can find out more about this vulnerability at https://bugzilla.mozilla.org/show_bug.cgi?id=558584
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