FF3 user reported bug about SSL certificate warning
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The single biggest obstacle here is not that Firefox couldn't convey the problem to the user, but that the user didn't pay any attention to what Firefox was trying to tell them. When the user thinks they're always right, the software can never tell them otherwise...
Granted, I hate FF3's cert complaining process and I'm sure it could be improved, but no matter what you do, short of refusing to accept bad certs, this problem will continue to occur.
Oh, and Mozilla, while you try to fix this, will you please add the CACert root certificate to your browser? For the love of God, why should I trust a $5000 certificate from an automated purchase with Verisign any more than a free certificate verified by community members?
Edit: the first reply seems to be a better / more thorough explanation of the point I was trying to make: http://www.mail-archive.com/dev-tech-crypto@lists.mozilla.or...
This is a usability failing, pure and simple.
The moral: FF3's self-signed cert warning isn't ominous enough.