The state of PDF support in Firefox on OS X has me stuck at FF 3.6, and it doesn't look like that'll be changing for a while (unless I want to experiment with random xpi's and running FF 4+ in 32-bit mode, etc).
Until that's resolved, all the fancy CSS tweaks in the world won't mean a hoot.
Until that's resolved, all the fancy CSS tweaks in the world won't mean a hoot.