After upgrading to firefox 15, I can not longer connect to my company website. It does use a certificate that gets a validation error because the CN doesn't match the web site address (extra character in the CN). In all previous versions of firefox, after it reported the error, it would allow me to continue anyway if I chose. I have done this every two weeks for a year, but now it won't let me continue. T
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The Shockwave and Java applications may need 'PLUGIN UPDATE' for newer versions. Suggest a check for any outdated PLUGIN UPDATE found from the Mozilla Firefox Toolbar 'Help' Menu > 'Firefox Help' > [lower right margin displays link to more info to review and 'UPDATE PLUGIN's!
Try to rename the cert8.db file in the Firefox profile folder to cert8.db.old or delete the cert8.db file to remove intermediate certificates that Firefox has stored.
If that helped to solve the problem then you can remove the renamed cert8.db.old file.
Otherwise you can rename (or copy) the cert8.db.old file to cert8.db to restore the previous intermediate certificates.
Firefox will automatically store intermediate certificates when you visit websites that send such a certificate.