Firefox plugin cracks PDF copy-restriction

Sherwood sez, "This Firefox extension allows you to view linked PDFs as HTML, allowing the same copy protection bypass mentioned in Cory's Use Gmail to break PDF copy restrictions post." Link

Update: SAPO suggests breaking the DRM with MacOS X:

* Open the restricted PDF in ColorSync.
* Choose File: Save as, and name it whatever you like.
* Open the saved file in Adobe Reader or Preview and enjoy!