Firefox looses tabs on crash or End Task

Since upgrading to FF 12 I now regularly loose my tabs. When FF exits via an End Task from Task Manager or a system crash, it seems to loose the tabs. On restart of FF it coems up with the "Well this is embarrassing ..." but the list of restore windows/tabs is completely blank !
This is a complete nightmare, as I have lost months of saved up tabs and research. Please can someone help, otherwise this will be the final straw with FF which I've used since inception !

Same problem here. Since version 12 Firefox has problems with Flash(on Windows, on Linux works great), you close all youtube tabs and it still plays in the background, if you close Firefox all ends. But this time, I tried to close Firefox, it imitated closing but it was still playing in the background even if I closed in it the youtube tabs, so, I checked the Task Manager's processes list and saw there firefox.exe sitting and not releasing the memory to close. I closed it manually and when I tried to reopen I lost all my tabs. Taking my 4 MB sessionstore.bak and replacing sessionstore.js doesn't work either because when I run Firefox it replaces this file with a sessionstore.js that weights about 700 Bytes and in Firefox I have only the "about:home" page. Trying to open the "about:sessionrestore" page doesn't show anything either...
I found this site: http://dag.wieers.com/blog/what-if-firefox-loses-your-tabs and in the comments this Python script: http://jacaranda.org/firefox/fixstore.py but it doesn't work for me with Python 3.2. I think that Firefox should have by default something like that.

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