Perspectives currently does not work in Firefox 32 and higher. This is a known issue. When Perspectives runs you will see a yellow exclamation icon and the error message “‘an internal security change error occurred: TypeError: ti.cert.md5Fingerprint is undefined'”.
Firefox 32 is the first version where support for the MD5 hashing algorithm has been removed (see BugZilla). From a security point of view this is great news – the MD5 algorithm is known to be not completely secure, and software should be moving to better hashes. We also want Perspectives to move to using better hashes.
Unfortunately Perspectives needs some internal fixes before this upgrade can be completed. We are actively working on fixing this error and will update Perspectives ASAP. Thanks to everyone who has contacted us about this issue.