[Bug 276697] www/firefox: erratic U2F support

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276697

--- Comment #5 from Christian Weisgerber <naddy@FreeBSD.org> ---
I typically have three /dev/uhidN devices on that machine.  One from the
Yubikey authenticator, two from unrelated USB peripherals.  Looking at the
ktrace results, I see that firefox spawns a parallel thread for each of my
/dev/uhid[0-2] device nodes to check whether the device is an authenticator. 
The threads probing the wrong devices exit quickly, the third one proceeds to
establish communications with the authenticator.

I wonder whether the results from the threads are mixed up and there is
effectively a race between threads for discovering the authenticator.  The
erratic behavior I observe would fit a race condition.

I have now unplugged the other uhid devices, so there is only the single
/dev/uhid0 for the authenticator, and so far I have been unable to reproduce
the problem.

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