MDVA-2009:186 : firefox

This is a maintenance and bugfix update for firefox 3.5.x: Bug 468562 - ASSERTION: Inserting multiple children without flushing Bug 521750 - Put a runtime NSIsMainThread check in nsCycleCollector::Suspect2 and Forget2 Bug 525326 - Crashes in gif decoder @ xul.dll@0x348945@...