I am using qpdf to convert PDF to linearized PDF files. The Byte requests are working on Chrome and Internet explorer but its not working on Firefox.
Firefox 18.0.2 (On Windows)
Adobe Acrobat reader - 10.1.4.38
Adobe Reader's (Edit > Preferences >)
Internet > Fast Web View - Enabled
Allow speculative downloading in the background - Enabled
Display PDF in Browser - Enabled
Using Apache x_send_file to render the files