Have you ever seen the new warnings for various “invalid” SSL certificates while using Firefox 3? If yes, you might have realized that this one is scarier as it more difficult to ignore than the earlier versions of Firefox. If you came across a site that has certificate authority with the set of root certificates that your broser, in this case Firefox trust, you will be able to reach the site, while if the website only has a self-signed certificate, Firefox 3 will puts up a nasty warning.
In order to access those sites you will be asked to click a series of dialogues and scary warnings. Well actually Mozilla only want to say that the self-signed certificates are untrustworthy, not invalid necessarily, but not something that the browser can trust without asking the user.
That is why, for sites that do e-commerce or transmit and receive sensitive information, it is highly recommended to have a certificate authority. It will be the best solution because most users tend to ignore detailed dialog that will be appear if they try to access you site and they will choose to leave it instead of following the certificate test required by the browser. While fr the users, you can start to understand that the browser is actually want to protect you while still allowing you to override the protections. You can use the Perspective Firefox Extension to alleviate the problem in the long term or just click your way past the multiple warnings.
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