A while ago, I had to disable Secure Boot in UEFI in order to install a third-party driver.
Now that this third-party driver isn't required anymore (due to kernel updates), I have uninstalled it.
Having removed that unsigned driver, I thought it might be a good idea now to enable Secure Boot again. Is it? Or could malware have caused damage in the meantime, e.g. adding new Secure Boot keys, so that Secure Boot is not "secure" anymore after it has been disabled once?