Epiphany crashes when closing a Gmail tab, regardless of Gmail state or any other open tabs. I have npviewer providing Flash plugin and ad blocker extension enabled. When run under gdb, the error appears as follows:

(epiphany:5592): Gdk-ERROR **: The program 'epiphany' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadDrawable (invalid Pixmap or Window parameter)'.
  (Details: serial 7915 error_code 9 request_code 62 minor_code 0)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the GDK_SYNCHRONIZE environment
   variable to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)

Program received signal SIGTRAP, Trace/breakpoint trap.
0xb58341ad in g_logv () from /usr/lib/libglib-2.0.so.0