Dupe/related to bug 330756.
The site is using Yahoo User Interface Library (YUI) to disable the context menu.
Reporter, are you still seeing this issue with Firefox 3.6.13 or later in safe mode? If not, please close. These links can help you in your testing. http://support.mozilla.com/kb/Safe+Mode http://support.mozilla.com/kb/Managing+profiles You can also try to reproduce in Firefox 4 Beta 8 or later, there are many improvements in the new version, http://www.mozilla.com/en-US/firefox/all-beta.html
No reply, INCOMPLETE. Please retest with Firefox 3.6.13 or later and a new profile (http://support.mozilla.com/kb/Managing+profiles). If you continue to see this issue with the newest firefox and a new profile, then please comment on this bug.
http://picturesque.phanfare.com/4506587 The page has changed: There is no longer a popup saying "This function is disabled". FF 4 and 3.6.13 successfully prevent the suppression of the context menu when contextmenu.enabled=false.