This is just a name search so may not be correct. For correct result you need to upload and test your file (s)
If tested before, click rescan for a fresh result

FirefoxCtype.dll
https://www.virustotal.com/en/file/beb9b6863a2e3df49ae96e9e05910915aec69f9433b3dcdb1a56965bfa81094e/analysis/

npFirefoxplugin.dll
https://www.virustotal.com/en/file/2e4118f281f131b02759a56eb298afee18f08b8c1cb94317f0ef001bb7d614de/analysis/