'''Dear sir/Madam''' I'm using Firefox. 13.0.1 When I open a Pdf file from a particular site(armandaily.ir) can not display the file. While at the same time, other browsers do not have a problem. ------- If I click the refresh button several times on that page, will be displayed correctly ------- When I disable the Acrobat plugin, file to be downloaded. I get notices that the downloaded file size is less than the original file. When I want to open it in Acrobat, also acrobat, can't open it and I get failure message: the file is corrupted. ------- I'm using Windows XP with sp3 ------- So far I have not encountered such a problem in Windows 7 and Firefox. 13.0.1 ------ A Sample Link: http://armandaily.ir/1391/05/12/Files/PDF/13910512-1968-13-14.pdf ---- Unfortunately, many users have this same problem Best Wishes alireza