Flash player problem with Firefox

[DESMONTS]

Binary package hint: firefox-3.5

With certain internet sites, working with Flash, some links don't work. When I click on it, nothing happens.
For example, on this site : "http://www.yvelines.fr/archives/home.html", all the items of the left main menu don't work. With this site : "http://www.daum.fr/", impossible to select "Europe" or "Asia",... Clicks on these links are inoperatives.

My configuration :
Ubuntu 9.10
Firefox 3.5.5 (installed with Ubuntu 9.10 package)
Flashplugin 10.0.32.18
Java 6.16

ProblemType: Bug
Architecture: amd64
Date: Fri Nov 20 21:45:45 2009
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: wl nvidia
Package: firefox-3.5 3.5.5+nobinonly-0ubuntu0.9.10.1
ProcEnviron:
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: firefox-3.5
Uname: Linux 2.6.31-14-generic x86_64