Comment 31 for bug 1849346

(In reply to Mantas M. (grawity) from comment #6)
> The magic disappears in Firefox's AppArmor profile, which doesn't allow it to access `/tmp/krb5cc_*`. As an easy workaround until the Snap configuration is fixed, edit `/etc/krb5.conf` to relocate your Kerberos ticket cache somewhere Firefox *can* access it:
>
> ```
> [libdefaults]
> default_ccache_name = FILE:/home/%{username}/krb5cc
> ```

I just realized this won't work if you're also using Kerberos for NFS or AFS. :(