Do the menu items on the Menu bar work? Hit the Alt key ti reveal the Menu Bar, if it is hidden.

Or the keyboard commands for those items? { Ctrl + P } for Print. { Alt -> T -> O } for Options. { Ctrl + Shft + A } for Addons.

Do you have the toolbar buttons for those items on the Yahoo Toolbar? If so, try opening Customize and use the Restore Defaults button.

All the menu items on the Menu bar work, except "Print Preview". The first attempt resulted in a Print Preview dialog box showing "Progress: Preparing.....", which hung up for minutes. Further attempts would not even bring up the dialog box. So I can print as is but I cannot control the size or customize my print area.

I was also unable to open the "Customize" button on the menu, and therefore never could get to restore defaults.

Reset your printer setting as outlined here: https://support.mozilla.org/en-US/kb/fix-printing-problems-firefox#w_reset-all-firefox-printer-settings

But considering that Customize doesn't work for you, it might be best to just refresh Firefox. https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings

Changing the printer settings didn't help but the refresh did. However, I had to hunt down my old add-ons since they apparently are removed in the refresh process. Also, new pages in yahoo no longer open in a new tab with a Flickr photo (which was annoying). Don't know if that was a result of the refresh or yahoo changed the toolbar settings based on the billion negative reviews they were getting.