there's an unpatched security hole.
in any case, firefox will soon make pdf readers fairly redundant at least if you like reading them in browsers via plugins anyway..
never realised libreoffice can open and edit pdf files..... doh
though.. libreoffice does have its own problem. crap autoupdate. crap file association. bit unwieldy for just reading pdf.
foxit nowadays does have an uninstall thing.