Why do pdf files become black, when I open in Mozilla FF in Ubuntu 10.04?

When I open any pdf files through mozilla firefox (system runnning in Ubuntu 10.04) it turns into black and nothing is visible (sometime dotted lines instead of black). Please help to resolve this. It is very annoying since I have to download that pdf if I want to view. thanks

From ubuntu Karthick Bala

• This is just a wild guess, but you could try installing (or re-installing) the mozplugger package.

  From aperson