Firefox has not produced the result file within the maximum allowed time span
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. ps2pdf is necessary to convert postscript 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