The issue is with firefox, not my yubikey. Firefox detects a device with pkcs#11 capabilities, assumes that I must want to use it no matter what, then spams me pop-ups to log in with it. I have not found a config option to ignore specific capabilities for a securty device.

Firefox is enumerating all my devices and has determined that the yubikey has smart card capabilities, which it does, but I have no intention of using them in firefox. I am only using the TOTP features of yubikey in firefox.

I also have a microphone attached to my computer, but that doesn't mean firefox should assume I want it on and recording all the time.

In this picture you can see the screen shot under the "Privacy and Settings" screen for the "Security Devices" heading in the "Certificates" section.

As you can see, it has my yubikey under the "p11kit-proxy" node. I just want to be able to disable it for the p11kit-proxy section, but "unload" is greyed out.

I was able to solve this on my own by adding: "disable-in: firefox" into: /usr/share/p11-kit/modules/opensc.module

And now it doesn't show up.

It's ridiculous for firefox to be automatically importing and re-adding random security devices from my system without giving me the ability to disable firefox from excluding devices, and a security risk to do so.

A change mentioned in Fx 112.0 release notes could be related. https://www.mozilla.org/en-US/firefox/112.0/releasenotes/

The deprecated U2F Javascript API is now disabled by default. The U2F protocol remains usable through the WebAuthn API. The U2F API can be re-enabled using the security.webauth.u2f preference.

I solved this by disabling it in the opensc config. I did notice if I unload the p11kit-proxy node in the settings that it keeps coming back. It seems that by default p11-proxy kit it is loaded into every nssdb on the system.

I believe this is related: https://bugzilla.mozilla.org/show_bug.cgi?id=1161219

I would categorize it as a firefox bug that the p11-proxy-kit section that I am clicking "unload" on in firefox settings gets reloaded without my consent, but at least I have a workaround by disabling it in opensc.

See also:

• https://bugzilla.redhat.com/show_bug.cgi?id=1892137#c26

I'm seeing a similar issue, but I'm on macOS Ventura 13.5.2

There is no `/usr/share/p11-kit/modules/opensc.module` file -- I'm not sure if macOS has an equivalent to that file?

The prompt only pops up when I use a secondary FF profile.

I'm on OpenSC-0.22.0-rc1-74-gc902e199, rev: c902e199 + Yubikey Nano 5c.

Of course I found the solution about 5 seconds after posting my issue.

On the Security Devices Page (Which you can find by clicking on settings and then searching for "Security Devices"), find the OpenSC library and then click unload. This will remove it until you manually re-add the library.

The enterprise policy "SecurityDevices" lets you delete devices, it only requires a policies.json file in the installation path. Visit about:policies in the address bar for more details.