getFlash10.tce doesn't work for me. This extension supplies a script named /usr/local/bin/getflash10.sh, and I would invite an expert to look over this script. It uses wget to grab a certain file from fpdownload.macromedia.com and then uses tar to extract the archive's lone file, libflashplayer.so. It tries to put this file into a directory that may or may not exist, namely, install_flash_player_10_linux, and in my case this produces an error message and no flash installation.
There are enough clues in the script that I was able to get the installation done manually using a few shell commands, but if somebody out there can make a few changes so the script "just works", I'm sure others would add their thanks to mine.