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The Adobe Acrobat Reader x64 for has a little problem: it doesn't exist.

While arguing why using Acrobat Reader on Linux (instead of other pdf-readers), some just like it, some just need it, some just want it. Of course, you can find it in your favorite distribution's  repository, but it's usually the 8th version, while the last that shipped is the 9th (which has tabs, among other improvements...).

In order to have it, you have to download it from the official site, but you might encounter some problems while installing. This is how you get them easily fixed:

This example is for openSUSE 11.1 x64. Before installing (double-clicking on...) the rpm file, you have to install 

freeglut-32bit.

The package manager won't solve this dependency so just use the graphical yast2 or, from the command line:

sudo zypper in freeglut-32bit

Next, you can install the 32bit rpm on your 64bit system.

In order to also activate the Firefox extension, you'll have type:

sudo nspluginwrapper -i /opt/Adobe/Reader9/Browser/intellinux/nppdf.so

(nspluginwrapper is usually already installed; if it is not, it should be in the repositories; if it doesn't work, you can check here also useful for other 32bit firefox plugins you might need to use on your linux x64 machine)