Need an in-browser PDF reader?  Sure you could go with Adobe Reader, but who wants that bloated mess?  If you want something quick, built in and simple you need to go with the Nodobe add-on for Firefox.

At this time Nodobe support 38 different file format:
Adobe PDF:pdf
Microsoft Office:doc, docx, rtf, xls, xlsx, ppt, pptx
Images:png, [...]

I hate it when a PDF opens up inside of my browser, no matter which one I am using. It wastes my time and I would rather not have Adobe get it’s mitts all over my beautiful Firefox interface. Now you can either poke it back with a stick - which is not [...]