It also seems silly to me this idea between "tainted" and "clean" oses, such as Open and gNewSense, respectively. Take for example a user that runs Ubuntu [GNU/]Linux but proscribes to your free-only philosophy. They don't have to install the adobe flash plugin (which I believe is still a binary of sorts.) They can choose not to.
The Adobe flash plug-in is non-free software, and people should not install it, or suggest installing it, or even tell people it exists. That Firefox offers to install it is a very bad thing. I've been trying for a couple of years to get going a modified version of Firefox that won't offer to install any non-free plug-ins, but we don't have enough people to make this work very well. If you would like to help, please let me know. It is an important project.