I think problem is in the file /usr/share/xfce4/helpers/firefox.desktop
It call firefox with:
X-XFCE-Commands=%B -remote "openURL(about:blank,new-window)";%B; X-XFCE-CommandsWithParameter=%B -remote "openURL(%s)";%B "%s";
I think problem is in the file /usr/share/ xfce4/helpers/ firefox. desktop
It call firefox with:
X-XFCE-Commands=%B -remote "openURL(about:blank, new-window)";%B; CommandsWithPar ameter= %B -remote "openURL(%s)";%B "%s";
X-XFCE-