That is a problem with SpeedBit (sbfi32.dll), so you will have to disable this program for Firefox.

The crash report flagged these; SBFI32.DLL = '''AdWare'''.SBWatchman http://greatis.com/cleanvirus/adware/adware-sbwatchman-sbfi32-dll.htm AcLayers.DLL = Windows Compatibility DLL mswsock.dll = Microsoft icudt52.dll = International Components for Unicode ------------------------------------- You may have ad / mal-ware. Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article. ---------------------------------- Perform a System File Check to fix corrupted system files http://www.sevenforums.com/tutorials/1538-sfc-scannow-command-system-file-checker.html See if there are updates for your graphics drivers https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration ------------------------------- Also check for updates (Unicode)