Url is not valid and cannot be loaded

Hi all,
I have a problem with https sites with sefl signed certificate. On other firefox version (3.6.x ...) when i connect to the first time on this sites, a page ask me if i want to add a security exception and add the certificate to my certs chain. Since i have installed firefox4b10, i have a messagebox that say "url is not valid and cannot be loaded"
I have tested firefox4 b10 in safe mode, but nothing change. i run firefox 3.6.x, i get the security exception page, add an exception and then, i stop firefox and run firefox4b10, and now that the certificate is in registered, the site worked fine.
this happen both on windows and linux
Any help on this ?
Thanks.

Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
* Don't make any changes on the Safe mode start window.
See:
* [[Troubleshooting extensions and themes]]

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Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
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seems like maybe firefox mishandles untrusted certificates?
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example:
https://notes.corp.cat.com/
other browsers can load this URL just fine. When I visit it in Firefox, I get the error in a simple little message box with a yellow triangle exclamation point, titled "Alert".
ALSO.... when I click the "Home" button in firefox, I get the error, and the home page does not load. Currently the home page is set to "Mozilla Firefox Start Page."
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