Those plugins are not known to the plugin check website. You have to read their names and do a web search for newer versions.

The full list is also available at the " about:plugins " URL

Thank you for responding, Gryllida - I appreciate it but the programs that I had listed as the problem are updated and renewed daily either through their own prompting or me doing it manually - McAfee, for example, was just updated with a newer version the day before yesterday but is still listed as a "Unknown plugin"... also, with doing "searches", how does a person known whether what is found is legitimate or spam/virus/bot, etc?

You often need to install an external program for the plugins to work in which case they're not available for a separate download. If you keep the plugin's program up to date, that is enough.

When you search for unknown plugins, legitimate ones usually are available at official sites of the programs/companies which are using them.

Please let us know how that helps

Hi, i also have the same problem, and i try to keep my plugins all up to date, but the fact is that half of them continually says that are unknown!I did the research and try to download some of them - because the others can´t find the download buttons on the researched pages-, to download the newer version and still keep having the same message.For ex. i did the research for picnic and did the download of the newer version, although i thought i had already the newer version, and after doing that i closed firefox and open it again and clicked on check for updates and still gives me the same message saying that the plugin is unknown???'I just don´t understand!!The same thing for google talk plugin and for google earth, i downloaded the newer version and still keeps giving me the same message.I send here a screenshot of some of the plugins that have that message. I also realised that the big majority of them are from google, like google update, for ex.I just would like to say that i have the firefox updated too, i checked that. Thanks.