Some time ago in September my Bitdefender updated itself from 2018 version to 2019. Ever since then my web browsers that I use (Firefox, Explorer) don't recognize my smart card anymore. For example, when I try to log into my online bank account with my smart card it tells me to "make sure that your smart card is correctly inserted into the smart card reader".
I uninstalled Bitdefender today and surprise, surprise, now both Firefox and Explorer have suddenly no trouble recognizing my smart card. When I reinstalled Bitdefender it instantly reverted back to the same old story of "make sure that your smart card is correctly inserted into the smart card reader".