The issue is because the libgtkembedmoz shared library is not found, and may not be a part of the packages as stated by Adobe:

Adobe Reader 8.1.1 FAQs
http://blogs.adobe.com/acroread/2007/09/adobe_reader_811_faqs.html

Install the libxul0d package with the following command:

sudo apt-get install libxul0d

Start Acrobat Reader:

- Select Edit | Preferences
- Select Internet under Categories
- Enter firefox for the Browser Executable
- Enter /usr/lib/xulrunner/ for the libgtkembedmoz Folder
- Click OK
- Close Acrobat Reader
- Close Firefox