After 46.0.1 update X copy/paste from firefox to xterm does not work. Copy/paste works if firefox and xterm are in same X screen, but when xterm is in separate screen, paste does not work. I think this is caused by switching to gtk3, Bug 1186003 I tryed to run with GDK_DEBUG=events, i can see debug message when trying to paste to xterm, but nothing is pasted: Gdk-Message: selection request: window: 39845943 My setup: Dual monitros with separate X screens xterm on :0.0 and firefox on :0.1 Commands to start test setup: xterm -display :0.1 -e "~/firefox/firefox"& xterm& dpyinfo: name of display: :0 version number: 11.0 vendor string: Fedora Project vendor release number: 11704000 ......... default screen number: 0 number of screens: 2 screen #0: dimensions: 1920x1080 pixels (483x272 millimeters) resolution: 101x101 dots per inch depths (7): 24, 1, 4, 8, 15, 16, 32 root window id: 0x4f5 ..... screen #1: dimensions: 1024x1280 pixels (305x391 millimeters) resolution: 85x83 dots per inch depths (7): 24, 1, 4, 8, 15, 16, 32 root window id: 0x4f7 ......

Can you try with the gtk3-widget-factory program, please? That may be in a gtk-3-examples package. That would indicate whether this is a bug in GTK or may be in the way Gecko is using it.

I tested gtk3-widget-factory. Same problem there, cannot copy text from gtk3-widget-factory to xterm when they are in different screens. Other way works ok, same with firefox. Same problem with gedit also. Gedit uses gtk3 in fedora 22. Between firefox and gedit both "PRIMARY" and "CLIPBOARD" copying works ok. So this seems to be general gtk3 problem with multiple screens.

This migth be fedora 22 only bug that is fixed in upstream and 23: http://ftp.gnome.org/pub/gnome/sources/gtk+/3.17/gtk+-3.17.6.changes https://bugzilla.gnome.org/show_bug.cgi?id=721398 https://bodhi.fedoraproject.org/updates/gtk3-3.17.6-1.fc23

I upgraded fc22 -> fc23 and bug goes away. So this is gtk3 bug, not mozilla bug. Marking as resolved invalid.