hello, could you provide your latest few submitted crash reports? please enter about:crashes into the location bar, copy the latest few report ids from there starting with bp- & paste them here into a forum reply. this will give us a better understanding what may be triggering those crashes.

The last crash report is over a year old...so no data to view.

My Microsoft Excel and Word are crashing at open also. Something major is hosed and it isn't with Firefox. Must be a problem with my OS.

Hi, you can open a DOs Prompt at as a Administrator search cmd.exe then Right Click and open as Admin.

Copy/Past Sfc/ scannow then enter, reboot after (sfc/<space>scannow)

May fix something up with registry and system files. G'luck