The program 'firefox' received an X Window System error.This probably reflects a bug in the program.The error was 'BadRequest (invalid request code or no such operation)'. (Details: serial 44 error_code 1 request_code 154 minor_code 25) (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 --sync command line option to change this behavior. You can then get a meaningful backtrace from your debugger if you break on the gdk_x_error() function.)