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Many sites with Flash video players will download video files to /tmp on Linux, with temporary filenames like "FlashbGTHm4". These will often play in mplayer, totem, or other movie playing software. You must first navigate to a video page, let it start loading, and then pause playback.
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sigh.. mplayer /tmp/Flash*
There's often more than one "Flash*" file in /tmp from other open browser windows or from stale files left over from crashes
if you are using some compositing window manager you should (probably) add -vo sdl or -vo xv to have it properly displayed on the screen:
mplayer $(ls -t /tmp/Flash*|head -1) -vo xv