PDFs load a translucent image of my desktop, not the PDF itself.
When I try to open a PDF in Firefox 4 (up to date), the PDF loads as a partially translucent image of my desktop background (or whatever program is open behind Firefox) and it renders the PDF unreadable. I have to download any PDF I want to view because the PDF, as well as the Save/Print/etc. buttons are glossy and nearly impossible to see.
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uninstall adobe PDF reader from your computer and then restart your system. after restart install it again.
or try the free the replacement of adobe PDF reader;