Taken from Bugzilla:

This privacy flaw has caused my fiancé and I to break-up after having dated for
5 years.

Basically, we share one computer but under separate Windows XP user accounts.
We both use Mozilla Firefox — well, he used to use it more than I do but now
we don’t really use it. The privacy flaw is this: when he went to log-in under
his dating sites (jdate.com, swinglifestyle.com, adultfriendfinder.com, etc.),
Mozilla promptly asks whether or not he’d like Firefox to save the passwords
for him. He chose never, obviously. However, when he logged off his user
account, and I logged onto my Windows XP account X amount of days later, I
decided to use Firefox because hey — it loaded everything much more
efficiently, was better to work on with website designs and is a lot more
stable than IE7beta2.

Firefox prompted whether or not I’d like it to save my password for logging
into my website. I chose never and changed my mind. I went into the Password
Manager to change the saved password option from Never to Always and that’s
when I saw all these other sites that had been selected as “Never Save
Password.” Of course, those were sites I had never visited or could ever dream
of visiting.

Then I realized who, how and what… and sh*t hit the fan. Your browser does
not efficiently respect the privacy of different users for one system.

Reproducible: Always

Steps to Reproduce:
1. Create 2 unique user accounts (for steps sake, let’s call the two accounts
Joe and Mary) in Windows XP Home.
2. Logout and sign-in under Joe.
3. Open Firefox and go to an e-mail site or to jdate.com or wherever.
4. Attempt to log-in to the site so that Firefox will ask whether or not you
want your password saved.
5. Choose not to save the password.
6. After successfully logging in and having selected the “never save password”
option, logout.
7. Log-in as Mary and open Firefox.
8. Browse, browse, browse… but you don’t really have to. Just go to “View
Saved Passwords,” click on the tab that will show you sites to never save
passwords for, and you’ll see whatever painful site Joe denied to save a
password for.
9. Break-up with fiancé.

Firefox should be respecting every single area of privacy per user on one
system. It’s not doing that… I’m going to submit this as Major because not
everyone shares one computer, but it should really be considered Critical.

The steps to reproduce are classic.

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Post written by Bwana