Known Issue with Firefox V.19 and PDF proof display - MKB 0067 Follow
There is a known issue with Firefox v.19 when displaying some PDF proofs.
Merged data may appear in different colors and sizes. Merged data may not appear at all. To correct this issue please see the attached PDF and make the appropriate changes in Firefox.
Notice the Content Type must be "Portable Document Format (PDF)" and not "Adobe Acrobat Forms Document (app...)"
A restart of Firefox is not needed after this change.