jQuery Context Menu Plugin doesn't work in jquery 1.4 in chrome/safari

jQuery Context Menu Plugin doesn't work in jquery 1.4 in chrome/safari

Hi,

Just upgraded to jquery 1.4 and this plugin doesn't work correctly in chrome/safari.

The context menu appears but the browser context menu also appears. This only happens when using jquery 1.4. 

I tried debugging the source code with no luck, does anyone knows why this stopped working?