One thing you might want to do when configuring slackware is to install the flash plugin in Firefox. Fortunately this is very simple.
First download the flash plugin tar.gz file from the adobe website other flash versions download page.
Select the relevant "32/64-bit" linux type and then select the ".tar.gz" option to download the plugin.
Run the tar command to decompress the tar.gz file. This creates a file named "libflashplayer.so".
#tar xvzf install_flash_player_linux.tar.gz
To install the plugin in Firefox simply copy the .so file into the mozilla plugins directory.
#cp libflashplayer.so /usr/lib/mozilla/plugins/
Finally restart Firefox and test if you can see a flash video. The homepage of this site displays a flash video so if you can see the video then flash is working.