Is this happening with PDF files?

The latest stable and latest development versions of the built-in PDF viewer are available as an extension and these version can possibly perform better than the version shipped with the current Firefox release. Latest development version of the PDF Viewer (pdfjs) extension:

• http://mozilla.github.io/pdf.js/extensions/firefox/pdf.js.xpi

The latest stable version of the PDF Viewer (pdfjs) extension:

• https://addons.mozilla.org/firefox/addon/pdfjs/

Current Firefox versions have enabled a built-in PDF Viewer that doesn't have all features that other PDF readers like the Adobe Reader have or may not function properly otherwise.

See also:

• https://support.mozilla.org/kb/view-pdf-files-firefox-without-downloading-them
• https://support.mozilla.org/kb/disable-built-pdf-viewer-and-use-another-viewer

The problem has nothing to do with it opening in pdf files. Thanks

Your post intrigued me Bob so I tested it myself. I'm pleased to report I have the opposite experience. Using version 28 my account was showing - $6122.00. Since updating to v29 it now shows CR 61,220.00. I can't wait for the release of Firefox 30 !!!

p.s. don't ask for a screenshot. ;-)