Not practical.  I have 5 or 6 windows with 10-15 tabs each open all the time. 
Trying a new profile, and then opening all the windows by hand, trying one 
extension at a time until maybe Firefox disappears again possibly (when, until 
recently, it had not done it at all)... Not practical.  If I had just added a 
new add-on, maybe that could have been it.  I have added nothing for months.
I strongly suspect that it has something to do with FF running out of memory, 
feeling cornered, and throwing in the towel.

I have eliminated the grey screens and have had no disappearing FF for
over a week now, by using the following technique:

1. plug in internet cable (so computer can grab the time from the internet)
2. Boot computer
3. unplug internet cable
4. start up Firefox, and run it for, say, 5 minutes - until it has put up all 
windows/tabs, and has stopped futilely trying to load pages without the internet
5. plug in internet cable again
6. load up only those pages I actually need at the moment.
I know by position where most of those are, and the rest I can see by clicking 
on the tab and looking at the address bar or at the first line of FF's "Problem 
loading page" sub-window for the tab.
Instead of taking up nearly 100% CPU and 80+% actual memory (1GB), its CPU 
usage is now about 25%, and its RES mem
usage is about 25% (261M).  Much quicker and more managable.

-- 
Firefox suddenly disappears several times lately - 2
https://bugs.launchpad.net/bugs/592597
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