From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.6) Gecko/20050323 Galeon/1.3.20

Description of problem:
ftp://ftp.adobe.com/pub/adobe/reader/unix/7x/7.0/enu/AdobeReader_enu-7.0.0-2.i386.rpm

The acrobat reader 7.0 i386.rpm released by Adobe contains the /usr/bin/acroread executable, but does not activate its own mozilla plugin by default. 

The shipped /etc/mozpluggerrc lists acroread ahead of xpdf and will execute it with the +useFrontEndProgram option for "don't open in existing instance" behavior, but the name of this option has been changed to -openInNewWindow in acoread 7.0, thus causing acroread to exit.

Version-Release number of selected component (if applicable):
mozplugger-1.6.2-1

How reproducible:
Always

Steps to Reproduce:
1. install Adobe acrobat reader 7.0 rpm
2. view URL pointing to PDF file
3. 
  

Actual Results:  mozilla shows a blank page

Expected Results:  Successful display of PDF file

Additional info:

I suggest trying acroread as a last resort for PDF in /etc/mozpluggerrc, favoring opensource viewers instead. If it is still desirable to support acoread in mozplugger then we should handle the version difference.