Earlier in the week I attempted to answer one of the "Ask Asa" questions about websites that use JavaScript to disable context menus. As I was investigating that issue, I called in some expert advisors, Chris Aillon and Johnny Stenback. Well, Chris and JST helped me with the answer and today Chris helps us all with the fix :)
If you're tired of website's disabling your context menu, grab a new build of Firefox or Mozilla tomorrow and set the pref. You can do this by editing your preferences file or by using about:config. To use about:config, type about:config it in the URLbar and right-click anywhere inthe resulting list of preferences. Select New -> Boolean from the context menu and then fill in the values dom.event.contextmenu.enabled and false. That should block sites from being able to suppres your menus :-)
Anyone want to throw together a patch for Firefox's Advanced JavaScript Options window so we can set this with real UI?