I happen to like Foxit Reader for PDF viewing. I have been having a bit of a problem getting the Foxit Reader Plugin to work in Firefox. Each time I tried to get the Foxit plugin to open a PDF, I ended up with a blank tab.
Then I remembered a previous workaround I used. It requires IETab to work. (Previous, because I worked it out when I had Vista, but I forgot about it when I updated my PC to Win7).
Create a rule in IETab to open all PDF files in IE within Firefox.
Now when I click on a PDF file, it opens up in the browser with the IE version of the Foxit plugin, but at least it is opening in Firefox, not asking to be saved or opening Foxit Reader as a stand alone application.
Hope this helps.
Jak.