User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1) Gecko/20090624 Firefox/3.5 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1) Gecko/20090624 Firefox/3.5 On WinXP, I have a sound configured in the "Sounds and Audio Devices" control panel for the program event "Menu popup". Throughout Windows, this sound is triggered whenever I 1) click a menu or submenu from any application's menu bar, or 2) right-click to open up a context menu in any application. Starting with Fx3.5, middle-clicking with the scroll wheel on a page also triggers the "Menu popup" sound even though no menu is being opened. None of the other applications that I tested triggered this event when middle-clicking the scroll wheel. Reproducible: Always Steps to Reproduce: 1. set a sound for the event "Menu popup" in Sounds CP 2. middle click on a page in Firefox 3. listen to sound Expected Results: Middle clicking the scroll wheel should not trigger the "Menu popup" event as no menu is opened. Only that little white circle with two triangles is drawn and it clearly is not a menu.