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..
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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.
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foxit nowadays does have an uninstall thing.