Trouble with context and dropdown menu

[thomas janssen]

It's not available to arrive with the mouse an item of a Menu or pop-up window by clicking right mouse button. When i open a pop-up menu with right button of the mouse the window close immediately if i move the mouse.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: firefox 5.0+build1+nobinonly-0ubuntu0.11.04.2
ProcVersionSignature: Ubuntu 2.6.38-11.48-generic 2.6.38.8
Uname: Linux 2.6.38-11-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Tue Aug 16 12:03:08 2011
EcryptfsInUse: Yes
FirefoxPackages:
 firefox 5.0+build1+nobinonly-0ubuntu0.11.04.2
 flashplugin-installer 10.3.183.4ubuntu0.11.04.1
 adobe-flashplugin N/A
 icedtea-plugin 1.1.1-0ubuntu1~11.04.1
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcEnviron:
 LANGUAGE=de_DE:en
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: firefox
UpgradeStatus: Upgraded to natty on 2011-04-28 (109 days ago)