Dapper and Firefox and Thunderbird

[Erebus]

I upgraded to Dapper Drake (a.k.a. 6.6) the other day and the only down 
side is that periodically, for no reason that is readily apparent to me, 
when I return to my PC I find that either my Firefox and/or my 
Thunderbird have closed and I have to restart them.

Has this happened to anyone else?

Frank in Mississauga
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