The crash reports are OOM (out of memory) reports where not enough free contiguous memory is available and there is also insufficient space available in the Windows Page file. Make sure to close down unneeded applications to ensure that Firefox has enough memory available. Do you let Windows handle the Page file automatically or have you set a fixed size for the Windows Page File ? * Control Panel -> System -> Advanced -> Performance -> Settings If you use a fixed size for the page file then try the automatic setting and let Windows handle the page file automatically.