Can No Longer Save PDF Using FF

For many days I have been able to save pdf web pages when those pages appeared in my browser. I would call the page up in FF and then save the page using save as. I am running FF and XP. I thought FF gave me a save page as option showing save as pdf but maybe not. Anyway, I want to be able to save pdf files that show up in my browser when I find a pdf file in google. How can I save a pdf file when I see the file on my screen?

Thank you in advance.