(Running Windows 7 Home Premium) When Firefox 4.0 hangs (forcing a shutdown) or crashes (the screen has even gone to black) my windows fail to restore most of the time.

On the occasions when the windows fail to restore, I usually see a blank start page with something to the effect of "about:restore" or "about:restore session" in the URL line. I've tried pressing enter, but it didn't help. Other times, I've immediately tried going to the History menu, but the "Restore Previous Session" menu pick is faded out. I followed the help posted here to activate the restore windows feature, but the windows still fail to restore most of the time. I'm not a techie, so I'd really appreciate some easy to understand help.

The DMP file is inconclusive. You could run driver verifier to find the underlying issue but WPR is often easier.
In order to diagnose your problem you will need to download and install the below
Install the WPT (windows Performance Toolkit) 
http://www.microsoft.com/en-us/download/details.aspx?id=30652
Help with installation (if needed) is here
When you have, open an elevated command prompt and type the following 
WPRUI.exe (which is the windows performance recorder) and check off the boxes for the following:
First level triage, CPU usage, Disk IO.  
If you problem is not CPU or HD then check off the relevant box/s as well (for example networking or registry)  Please configure your as per the below snip
Click Start
It will reboot 3 t imes and record the data to a file and tell you its name and location.
Zip the file and upload to us on Onedrive (or any file sharing service) and give us a link to it in your next post.
These crashes were related to memory corruption (probably caused by a driver). 
Please run these tests to verify your memory and find which driver is causing the problem.  
If you are overclocking (pushing the components beyond their design) you should revert to default at least until the crashing is solved. If you don't
know what it is you probably are not overclocking.
Since it is more likely to be a driver please run verifier first.
1-Driver verifier (for complete directions see our wiki here)
If verifier does not find the issue we can move on to this.
2-Memtest. (You can read more about running memtest here)
Co-Authored by  JMH3143
Wanikiya and Dyami--Team Zigzag

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