Caution: rough seas ahead. You appear to be using an older version of Firefox.
I don't know about you, but some of the error messages out there are pretty lame. The Daily WTF site contains some of these here and here. Today this has happened to me, but not for very obvious reason.
My inner geek installed the development (daily) version of Firefox (code-named Bon Echo) on my home machine. It downloads and installs the latest version of Bon Echo every evening and politely asks to reinstall itself. Since it restores the session and doesn't crash too often, i'm OK with it for now. But here is what Yahoo! Mail showed me after the last Bon Echo restart:
While this is admittedly funny (and for now the majority of Firefox users are geeks, so it's OK), here is what the Help/About screen shows:
So - how about investing some time in verifying that something is an error instead of investing time in reporting it?