What do I do if my screen freezes while viewing a PDF in Mozilla Firefox?

It seems to be a bug with Mozilla Firefox that is causing screens to freeze.

To unfreeze your screen:

1. Make note of the name of the machine you are on.
2. Log into another machine
3. ssh into the machine that is frozen
4. type

pkill -9 -u your_username mozilla

5. This should kill the mozilla process that is running and your screen should return to normal.

If not, type

pkill -9 -u your_username metacity

Your window manager should restart and your screen should return to normal.

To avoid Mozilla Firefox from freezing up when viewing PDF files, save the file to your home directory and open it from there.