(Details: serial 11225 error_code 8 request_code 7 (core protocol) 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.)

Just upgraded to said version and every time I uncheck the Title Bar option in the Customize interface, Firefox crashes. I ran it from the console and got this: (firefox:5279): Gdk-WARNING **: 19:14:07.526: Can't set ParentRelative background for window 0x360004d, depth of parent doesn't match (firefox:5279): Gdk-ERROR **: 19:14:12.304: The program 'firefox' received an X Window System error. This probably reflects a bug in the program. The error was 'BadMatch (invalid parameter attributes)'. (Details: serial 11225 error_code 8 request_code 7 (core protocol) 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.) ExceptionHandler::GenerateDump cloned child 5499 ExceptionHandler::SendContinueSignalToChild sent continue signal to child ExceptionHandler::WaitForContinueSignal waiting for continue signal... [Child 5343, Chrome_ChildThread] WARNING: pipe error (3): Connection reset by peer: file /build/firefox/src/mozilla-unified/ipc/chromium/src/chrome/common/ipc_channel_posix.cc, line 363 Trace/breakpoint trap (core dumped) This never happened on older version and I have no plugins/extensions installed.