I get this as a result:

GST_PLUGIN_SYSTEM_PATH=/dev/null GST_PLUGIN_PATH=/dev/null nuvolaplayer
No bp log location saved, using default.
[000:000] Browser XEmbed support present: 1
[000:000] Browser toolkit is Gtk2.
[000:001] Using Gtk2 toolkit
No bp log location saved, using default.
Gtk-Message: Failed to load module "overlay-scrollbar"

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",

(npviewer.bin:4387): Gtk-WARNING **: Unable to locate theme engine in module_path: "murrine",
Gtk-Message: Failed to load module "canberra-gtk-module"
[003:164] No bp log location saved, using default.
[003:164] Browser XEmbed support present: 1
[003:164] Browser toolkit is Gtk2.
[003:164] Using Gtk2 toolkit
[000:000] No bp log location saved, using default.
   libsoup  Warning No feature manager for feature of type 'SoupProxyURIResolver'
p11-kit: couldn't load module: /usr/lib/i386-linux-gnu/pkcs11/gnome-keyring-pkcs11.so: /usr/lib/i386-linux-gnu/pkcs11/gnome-keyring-pkcs11.so: cannot open shared object file: No such file or directory
*** NSPlugin Viewer  *** ERROR: rpc_end_sync called when not in sync!
Segmentation fault (core dumped)