Well, it seams that war between Firefox and Chrome in my life is not over yet, despite brave decision I have made.... I was forced to write small widget in Silverlight, and to be honest I was having hard time debugging it in visual studio - somehow, I couldn't hit any breakpoints. Well shit happens. After an hours spend on that i've decided to change browser to IE thinking - Microsoft products goes well with Microsoft products. I wasn't sure about that but surprisingly, it worked. After some time of googling I managed to find a solution for firefox: 1. In Firefox address bar type "about:config" and accept warning 2. Change value of the entry "dom.ipc.plugins.enabled.npctrl.dll" to "true" 3. Restart Firefox It worked just great. I still haven't managed to find a proper solution for Chrome browser. I guess until I am ready with this widget Firefox has to be my temporary browser... eh ... Anyone with Chrome fix/workaround?