The BackTrack 5RC3 solution fails to install Flash Player for Firefox. The BackTrack 5RC3 GNOME 64-bit system is installed. The default version is Firefox, But Flash Player is not installed, so it is a tragedy to watch online videos, so you have to install them yourself. However, during installation, libflashplayer. so is copied to/usr/lib/mozilla/plugins. As a result, firefox still cannot be automatically loaded, and libflashplayer. so is copied ~ /. Under mozilla/plugins, The result still failed. Later, I tried to use a 32bit Flash Player. Note: The 64-bit version of BT5RC3 Firefox is indeed installed with 32-bit firefox. what's even more annoying is that the Adobe website recognizes 64-bit Firefox, which is really depressing! Solution: 1. Download The Flash Player of 32bit linux and copy libflashplayer. so to/usr/lib/mozilla/plugins or ~ /. Mozilla/plugins.