NB: as of July 2010, Adobe temporarily paused development of the 64 bits Linux version. This means that, although the download is still available, no security updates are currently being published, and this version of Flash does contain some serious security flaws.
Installing Flash for Firefox on Linux 64 bits is easy, but it’s a bit boring because since it’s still in alpha stage, there is no automated process to do it.
The manual steps are detailed here: https://fedoraproject.org/wiki/Flash#64-bit_alpha
In order to ease the pain, I eventually decided to make a tiny bash script that does this work for you. All you have to do, though, is to find the latest version number here on Adobe Labs (at the bottom of the page) and edit the script to set the proper version number (second line). Here’s the script (I hope WordPress doesn’t kill the quotes like it likes to do…), just copy/paste it, edit the version if needed and save as an .sh file that you’ll chmod to 744 and run:
echo "Downloading Flash Player $VERSION for Linux x86_64..."
tar zxvf libflashplayer-$VERSION.linux-x86_64.so.tar.gz
echo "Moving file"
sudo mv libflashplayer.so /usr/lib64/mozilla/plugins/
echo "Cleaning up"
echo "It should work even if Firefox was running, without restarting it."
This script was tested (and worked) on:
- Ubuntu 9.10 x64
- Ubuntu 10.04 x64
- Fedora 13 x64
Edit (28 June): other source (in French): http://doc.fedora-fr.org/wiki/Flash_:_Installation_du_plug-in
Edit (11 July): updated tested Linux versions.