I don’t know if there is any support in Haiku at the OS level or in each browser for 2FA using Yubikey ?
All I know is that when I try to login to Google, or 1Password both of which are configured to used my physical YubiKey the browser just hangs forever and becomes unresponsive. This happens with:
Does anyone use this on Haiku ?
Jut noting here that the same happens in WebPositive but it only makes the current tab unresponsive while on FireFox and Falkon the whole app ends up not responding.
Getting this also when trying to login at invent.kde.org 
I have it working on WebPositive though, but then again, gitlab s*** in there.
Oh, I don’t have a kde account (I think). Do you have a google or 1Password account to test there by any chance ? The annoying part with Google is I cannot chose another login method as it has to fail to get the key first to offer options options such as app-based 2FA.
I would like to open a ticket for this but I have no idea in which category this should go. Not sure if it is a system level issue or an issue in each browser. I suspect Firefox derivatives have their own implementation.
BTW, I never even tried with a key connected. It crashes already without one.
I can login on gmail with IceWeasel, so it’s a bit weird, only know it’s with 2FA at invent, freezes complete on any other browser beside WebPositive.
EDIT, with google (gmail) I can have it send me a login code to my mobile.
Not exactly a solution but the only browser I can successfully login with Google is Gnome Web (epiphany). It also crashes but when I come back it restores the tab and google offers me the other login options.
In IceWeasel and WaterFox and I assume any Firefox derivative I found a solution:
Go to about:config:
search for
security.webauth.webauthn_enable_usbtoken
Click to set it to false. After that it will fail bt not crash.
No solutions for Falkon so far.
I opened a ticket on haikuports . I failed to select the projects (Waterfox / Iceweasel ) :-/
I’ve found the same thing with Iceweasel. I use Yubikey as my physical 2FA token for logging in to Fastmail or Bitwarden etc but Iceweasle freezes entirely when I try to do so.
On other platforms I think that a new tab opens up to allow for FIDO authentication with Yubikey but nothing opens on Iceweasle so I think that may have something to do with it though I’m no expert. I tried disabling Iceweasel’s pop up blocker for the app.fastmail.com domain and the vault.bitwarden.com domain but this did not change anything.