SOLVED: Where can I get PDF reader plugin for Firefox

[Primoz]

I installed Acrobat (from medibuntu repo) but I still can't view PDF files in Firefox...
Can any one help me?
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EDIT:
I should do better google search before posting.
I found that how-to is located on this site:
http://www.ubuntugeek.com/how-to-ins...isty-fawn.html