The support for Firefox 8 has indeed been provided with the latest Acrobat/Reader 10.1.2 release. Please refer:
You should be able to use the floating toolbar (at the bottom of the PDF) from within the PDF (which is opened in the browser) to print the PDF.
Can you please try and see if printing using the floating toolbar works on FireFox 8.
The floating toolbar does work, as does Ctrl-P and right-click -> Print.
We've had several users who are used to using "Print" from the File menu in Firefox 8/9. That does not work. I believe we are still using Reader 10.1.1, though. I'll check to see if 10.1.2 works any better.
Just confirmed...problem still exists with Adobe Reader 10.1.2 and Firefox 9.0.1.
I can confirm this issue also. The Firefox file-print option does not work with Firefox 9.0.1 and Adobe Reader 10.1.1.33 or with 10.1.2.45.
The print buttons within the plugin window do work.
Running Windows 7 pro 64 bit.