Well, I did the next thing:
1. goto Synaptic and select arch i386
2. install ia32-libs-multiarch:i386
3. goto arch amd64
4. install ia32-libs:amd64
5. goto arch i386
6. install firefox:i386
I think I did wrong, number 4 should be before 2 imho, because number 2 shown me some errors for lib sql-something.
Adoe Flash package didn't install, so I had to do it manually:
Adobe Flash 32-bit version (install_flash_player_11_linux.i386.tar.gz):
cp libflashlayer.so ~/.mozilla/plugins
sudo cp -r usr/* /usr
The only thing doesn't work: after download, when I click on "Open file location" Firefox cannot find the file manager (Nautilus 3.4.2).
How do I fix it?