Comment 28 for bug 1849346

@frigo Thanks for the tip.
Unfortunately my systems requires pam_krb5 which has precedence over default_ccache_name and sets KRB5CCNAME directly.
I tried to set ccache_dir in the pam section of krb5.conf but I didn't manage.
While waiting for this to be fixed I'll continue with the not-snap version of firefox ...