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Better: use this plugin: http://code.google.com/p/firefox-mac-pdf/

It uses the native Quartz PDFKit backend.

Hilariously, the official Acrobat plugin now only works in Safari on OS X — the only browser that absolutely does not need it. I think the change happened during the Intel transition, so you can't easily use an old version either.

Firefox on the Mac is a decidedly second-class experience. I still use it from time-to-time because of extensions, but Chrome, and especially Safari, are far more pleasant out-of-the-box experiences.