Why is Firefox now wiping my profile with each update?

When I upgraded to Firefox 30.0, all of my data was wiped: history, add-ons, bookmarks etc. It's not just that Firefox is using a different profile - my Profiles folder had nothing in it.
Exactly the same thing has now happened in upgrading to 31.0.

These can't get your data back, but will help in the future.
These add-ons can be a great help by backing up and restoring Firefox
'''[https://addons.mozilla.org/en-US/firefox/addon/febe/ FEBE (Firefox Environment Backup Extension)]''' {web link}
FEBE allows you to quickly and easily backup your
Firefox extensions, history, passwords, and more.
In fact, it goes beyond just backing up -- It will actually rebuild
your saved files individually into installable .xpi files.
It will also make backup of files that you choose.
'''[https://addons.mozilla.org/en-US/firefox/addon/opie/ OPIE]''' {web link}
Import/Export extension preferences

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