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Firefox Check Your Plugins found "unknown plug-ins". My other plug-ins are up to date. To keep Firefox running safely and smoothly can the "unknowns" be safely uninstalled? How do I know if I need them? Where do they come from?

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These are the Plug-ins in question; Yahoo! activeX Plug-in Bridge Unknown plugin Research Microsoft® DRM DRM Netscape Network Object Unknown plugin Research RealPlayer Version Plugin 12.0.1.666 Unknown plugin Research RealPlayer(tm) HTML5VideoShim Plug-In (32-bit) RealPlayer(tm) HTML5VideoShim Plug-In Unknown plugin Research RealNetworks(tm) Chrome Background Extension Plug-In (32-bit) RealNetworks(tm) RealPlayer Chrome Background Extension Plug-In Unknown plugin Research RealJukebox NS Plugin RealJukebox Netscape Plugin I cannot say with certainty any plugins known or unknown installed on my computer are problematic. My other plugins are up to date. "Unresponsive Scripts" comes up quite often. No particular website, Grooveshark and Centurylink more than any others. Are the two (Plug-ins and Scripts) related?

These are the Plug-ins in question; Yahoo! activeX Plug-in Bridge Unknown plugin Research Microsoft® DRM DRM Netscape Network Object Unknown plugin Research RealPlayer Version Plugin 12.0.1.666 Unknown plugin Research RealPlayer(tm) HTML5VideoShim Plug-In (32-bit) RealPlayer(tm) HTML5VideoShim Plug-In Unknown plugin Research RealNetworks(tm) Chrome Background Extension Plug-In (32-bit) RealNetworks(tm) RealPlayer Chrome Background Extension Plug-In Unknown plugin Research RealJukebox NS Plugin RealJukebox Netscape Plugin I cannot say with certainty any plugins known or unknown installed on my computer are problematic. My other plugins are up to date. "Unresponsive Scripts" comes up quite often. No particular website, Grooveshark and Centurylink more than any others. Are the two (Plug-ins and Scripts) related?