How can I roll back the last Firefox update on Feb 27th 2013. I really don’t like the built in PDF Viewer. I like it the way it was.
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Just switch the reader to something other than the built in one. Use the Adobe Reader plugin to view or download PDF files
I set the Portable Document Format (PDF) to use Adobe Acrobat (in Firefox). It worked great, it works just like it did before the update.