User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; pl; rv:1.9.1.1) Gecko/20090715 Firefox/3.5.1 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.1; pl; rv:1.9.1.1) Gecko/20090715 Firefox/3.5.1 When you open Firefox 3.5 and drag mouse after right click over the taskbar strange menu shows. Reproducible: Always Steps to Reproduce: 1. Right click inside window and don't drop 2. Drag the mouse over the taskbar 3. Drop right button Actual Results: It shows a menu with all options but none of them working Expected Results: There shouldn't be any menu or normal menu like when normal clicking on web page