From
http://www.basicconfig.com/install_a...lackware_linux
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Update!
The new 'install_flash_player_10_linux.tar.gz' file contains only 'libflashplayer.so' file when you extract it. What you need to do is just copy the libflashplayer.so file to the /firefox/plugins directory (and other web browser as well). Here's the complete 'howto' steps:
1. Download 'install_flash_player_10_linux.tar.gz' from adobe website.
2. Extract it when the download is finished. The command is tar zxvf /path-to/install_flash_player_10_linux.tar.gz.
3. Copy 'libflashplayer.so' to /usr/lib/firefox-3.X.XX/plugins directory. Here is the command example: cp /path-to/libflashplayer.so /usr/lib/firefox-3.0.13/plugins.
4. Open Firefox web browser. Type about

lugins to verify flash player.
That's all.
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hope that helps.