Comment 6 for bug 87262

Well, if you really cannot wait for a fix, there is a very bad alternative:
the accessibility options. Use alt-F1 to access the menu options, and
use the keyboard to move over to preferences -> keyboard. You can
use the tab key to move among the options, and go down to accessibility.
You can then enable the accessibility options, tab over to "mouse" and
enable mouse keys.

Now, you can use the keyboard number keys to move the mouse around.
Horrible, but it does work.