[Bug 2062148]

[jwm]

I'm seeing the same problem using the "firefox-next" beta build *without
snap* since at least 125, on Ubuntu 23.10, eg:

```
❯ apt-cache policy firefox
firefox:
  Installed: 126.0~b9+build1-0ubuntu0.23.10.1
  Candidate: 126.0~b9+build1-0ubuntu0.23.10.1
  Version table:
       1:1snap1-0ubuntu3 -10
           500 http://nz.archive.ubuntu.com/ubuntu mantic/main amd64 Packages
*** 126.0~b9+build1-0ubuntu0.23.10.1 1001
           1001 https://ppa.launchpadcontent.net/mozillateam/firefox-next/ubuntu mantic/main amd64 Packages
             100 /var/lib/dpkg/status
```
The site will ask for the button on the hardware token to be pressed, but it never lights up. In my case, this is true of three different Yubikeys, which otherwise work with Yubico Authenticator, and did work in the browser a few versions back.

A glance at `/etc/apt/history.log*` indicates that I hopped from
122.0~b9+build1-0ubuntu0.23.10.1 to 125.0~b6+build1-0ubuntu0.23.10.1,
and it was running 125 where I first observed the problem, today
(2024-05-04). Upgrading to 126 has not helped, sadly.

Hopefully that's enough to bisect the u2f code.

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https://bugs.launchpad.net/bugs/2062148

Title:
  Snapd 2.62 brakes U2F in Firefox

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