Добавляем репозиторий
sudo add-apt-repository ppa:nilarimogard/webupd8
Обновляем репозитории
sudo apt-get update
установка самого плагина
sudo apt-get install freshplayerplugin pepperflashplugin-nonfree
после чего нужно сделать
gedit ~/.config/freshwrapper.conf
и вставить следующее содержимое
# Audio buffer is used to continuously provide sound adapter with data.
# Values too low may lead to buffer underruns and stuttering. Values
# too high will lead to noticeable latency. Usually plugin selects size
# on its own, but you may override bounds here
# lower bound for audio buffer size, in milliseconds
audio_buffer_min_ms = 20
# higher bound of audio buffer size, in milliseconds
audio_buffer_max_ms = 500
# Xinerama screen used to acquire fullscreen window geometry
xinerama_screen = 0
# Path to the wrapped plugin library
plugin_path = "/usr/lib/pepperflashplugin-nonfree/libpepflashplayer.so"
# "Command-line" arguments for Flash
flash_command_line = "enable_hw_video_decode=1,enable_stagevideo_auto=1"
Перезапустить firefox и активировать сам плагин
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