With LC_PAPER set to a4, I get:
(process:22371): Gtk-WARNING **: Locale not supported by C library.
Using the fallback 'C' locale.
(firefox:22371): Gdk-WARNING **: locale not supported by C library
With this unset, firefox starts without complaint.
I have changed the content of /etc/papersize to
a4
in case that helps.
With LC_PAPER set to a4, I get:
(process:22371): Gtk-WARNING **: Locale not supported by C library.
Using the fallback 'C' locale.
(firefox:22371): Gdk-WARNING **: locale not supported by C library
With this unset, firefox starts without complaint.
I have changed the content of /etc/papersize to
a4
in case that helps.