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The problem is when I ask it to change actions for the pdf, the option for "use this plugin" is greyed out and it says none available.
Interesting, I would have thought that Adobe would have created a plug in for Firefox, like the ones for IE, Safari and Opera...
according to this page:
The plug in is not supported for Mac OSX. and the details link is how I found the answer.
This page says that Windows is supported. So I guess you just need to download the plug in.