I have FF17 & SB 3.76 & when I open the sandboxed FF as soon as I click on a new tab or try to open a link it freezes over with a 50% white screen covering for a while and goes into "not responding". Even the 'white fog' lifts but the "not responding" remains until I give up & by-pass SB. Eventually the tab or link finally opens, usually a minute or two later but every click of the mouse sends it tumbling again into 'not responding'. I have so far uninstalled & reinstalled both FF & SB. Nothing's changed. Browsers outside Sandboxie are fine.