During conversion on Linux using Firefox you may receive this error message:
Firefox hasn't produced the result file within the maximum allowed time span
ps2pdf cannot be found in folder /usr/bin but in /usr/local/bin. This program is necessary to convert postscript files into pdf files and is provided by Ghostscript.
Create a symbolic link from /usr/local/bin/ps2pdf to /usr/bin/ps2pdf
ln -s /usr/local/bin/ps2pdf /usr/bin/ps2pdf