It is very unlikely that firefox will support the "pepper API" in the near future. There is a bugreport asking for the support here, it was opened on 2012-02-22 and was closed on the same they as WONTFIX.
Also there was a newer discussion between Mozilla developers here, with basically the same result: They are not going to support the "pepper API" in the near future (or at all).
It is also important to note that the pepper version of flash is made by Google, not Adobe. One quote from the previous link:
Even if Firefox supported the Pepper API, we would still need a Pepper
version of Flash. And Adobe doesn't have one; Google does.
There are also some very interesting talks and facts about the "pepper API" in those two linked discussions, if you read them through you will get the idea why it is very unlikely that "pepper flash" will arrive to firefox.
What you can do to get "better" flash support for Firefox is to install pipelight
, which is a browser plugin which utilizes WINE to allow windows only plugins to run in a linux browser. So you can run the windows version of Silverlight, Flash, etc. from the linux version of Firefox. You can read more about it here. To install it do:
sudo add-apt-repository ppa:pipelight/stable
sudo apt-get update
sudo apt-get install pipelight-multi
Then to activate the pipelight flash plugin in firefox (and also deactivate the linux flash plugin):
sudo update-alternatives --install "/usr/lib/mozilla/plugins/flashplugin-alternative.so" "mozilla-flashplugin" /usr/lib/pipelight/libpipelight-flash.so 1
sudo update-alternatives --set mozilla-flashplugin /usr/lib/pipelight/libpipelight-flash.so
(If you would like to restore the original linux flash plugin later you will have to run
sudo update-alternatives --remove mozilla-flashplugin /usr/lib/pipelight/libpipelight-flash.so
)
The pipelight installation instructions were taken directly from the developers' website, from here.