When prompted, Save the downloaded file.Download the Firefox PDF Plug-in for Mac (this is the beta 1.2 plug-in the official 1.1.3 plug-in doesn't work with this procedure).If Firefox is currently open, quit and relaunch it.Check the box for 'Open in 32-bit mode.'.With the Applications folder open in Finder, do a Get Info on Firefox.But it turns out that with some simple modifications, you can get this plug-in to work just fine in Firefox 5 and probably future versions of Firefox, thus allowing you to view PDFs in the browser once again. That's right - there was no way to view PDFs in Firefox 4 or 5 as one could do in Safari, because the Firefox PDF plug-in didn't work above Firefox 3.6. Use a current version of Firefox, download the PDFs, and view them in a PDF reader app.Use Firefox v3 and the Firefox PDF plug-in for Mac to view PDFs in Firefox.Use Safari's in-line PDF viewer plug-in to view PDFs in Safari.To date, people who wanted to view downloaded PDFs on a Mac have had three options:
