I have recently installed Ubuntu and updated it to 14.04 LTS. I also installed Ubuntu restricted extras and youtube seemed to be working fine but when I tried to watch twitch.tv, the Mozilla Firefox flash plug-in was crashing.
It works for a few minutes when watching a stream and then crashes. I tried downloading the Linux Adobe Flash Player from the Adobe website and ran this command
tar -xvf install_flash_player_11_linux.x86_64.tar.gz sudo cp libflashplayer.so /usr/lib/mozilla/plugins/
I saw that someone on Youtube fixed it in this way but I still get the same problem of Flash crashing after a few minutes.
I'm still new to Ubuntu so if you know what is wrong can you go slow explaining any procedure to fix this.