Firefox hangs on startup in normal mode and safe mode, won't start in reset mode

using FF 26.0
using windows 7 home premium v 6.1 (latest)
My problems started after loading FF 26.0. If I start FF in regular mode it hangs. Same thing happens when I start in safe mode. I can shut FF down (while it is hung) by clicking the X in the top right corner.
When I start FF in safe mode and choose reset FF, it hangs without FF ever appearing; I have to shut it down using task manager. After shutting down in reset mode, I can start FF in regular mode and everything works fine. However, stopping FF does not shut it down. I have to use task manager to shut it down. Then I am back to square one when trying to start FF, i.e. reset firefox, hangs, task manager shut down, then start FF.
When FF is running, I can open a new FF window.All my addons are up to date. I have reinstalled FF 26.0, three or four times.
I have cleared cache and cookies.
I have scanned for viruses and rootkits etc. with microsoft security essentials and spybot.
I have been a happy user of FF for more than a decade and have never had a problem like this. Any help will be appreciated.
Thanks!

There has been an issue reported with a snippet on the about:home page.
See [[/questions/984193#answer-525530]]

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