So this has become very aggravating. To the point that I completely uninstalled all of Firefox and Chrome, rebooted, went into %appdata% and wiped all firefox, chrome, and lastpass data, rebooted, reinstalled Firefox, reinstalled the lastpass extension, and logged in with my Yubikey, being sure to select the '30 day' button.
Logged out of lastpass, closed firefox, logged out of windows. Logged back in, opened Firefox, logged into Lastpass, and after 3 or four seconds, it requests my Yubikey.
So it is distinctly broken.
Hey lastpass, are you going to fix this? I have been a premium subscriber ever since you introduced support for Yubikey.
Quite frankly, this is disappointing.