Thank you for your bug report, Ubuntu is not upstream for ibus so the bug might be better placed on https://github.com/ibus/ibus/issues instead.
So you only get the issue if GTK_IM_MODULE=ibus? What happens if you "unset GTK_IM_MODULE" and start firefox?
Thank you for your bug report, Ubuntu is not upstream for ibus so the bug might be better placed on https:/ /github. com/ibus/ ibus/issues instead.
So you only get the issue if GTK_IM_MODULE=ibus? What happens if you "unset GTK_IM_MODULE" and start firefox?