Comment 218 for bug 230102

(In reply to 84user from comment #210)
> (In reply to LL25255252 from comment #208)
> > To <email address hidden> and everyone else, you can install the simple "always
> > ask" addon
> > https://addons.mozilla.org/en-us/firefox/addon/always-ask/
...
> Thanks, but this does not work for me; I've opened an issue detailing my
...

Ok, I should have read the top note: https://bugzilla.mozilla.org/show_bug.cgi?id=419009#c142
which points to the Tab Mix Plus addon by onemen and Gary Reyes at https://addons.mozilla.org/firefox/addon/1122 .
I installed that on a clean Firefox 31.0 profile and it does what I expected Firefox should do: it warns me when closing multiple tabs, even if they are in a private browsing window.

However, I still feel that unmodded Firefox should have this basic option of warning the user before potentially losing data and time (as happens to me a few times).