TBB users can't enable flash even if they choose to
Some Tor users are in situations where they install Tor in order to reach youtube -- e.g. users in Turkey.
But Torbutton blocks plugins by default, so youtube is broken.
We point people at the Torbutton faq entry: https://www.torproject.org/torbutton/torbutton-faq.html.en#noflash which walks them through how to tell Torbutton to allow flash.
But in the Tor Browser Bundles, there is no flash, so the faq entry doesn't help them.
One option is to ship flash in the TBBs, in case they want it. But apart from the "bloat most users don't need" factor, I believe the flash license doesn't allow it.
Another option is to configure the Firefox in TBB to allow it to find other plugins in the system. Then we rely on Torbutton to prevent you from running them unless you choose to. That's bad news for security, since it puts more pressure on Torbutton to be perfect, and since it would allow the realplayer, adobe, etc etc plugins that the user has in their other Firefox install. It also isn't a perfect solution, since some users might not have another Firefox install.
Did I miss any options? Is there a way to let them download flash for their TBB Firefox? We hear reports of users who repeatedly try to install flash (because their firefox keeps saying it's not installed). Does installing flash plus following our torbutton faq work? If not, maybe making that workflow work is the best option.