FF won't enable Java when I try to bank online.

I've been using Firefox to deposit checks online for about a year. My bank uses Java and Active X to upload scanned checks, and normally Firefox prompts me to activate them when I'm in the process of banking. This month, at the moment I'm normally prompted to activate Java, an error message comes up instead. It says:

"Unable to update files in cache.

Name: FlatBedScan

SecurityException: com.sun.deploy/net.JARSigningException: Found unsigned entry in resource:"

Is this become FF has blocked Java because of its security vulnerabilities? I can't figure out a way to unblock it. I've re-installed Java, run diagnostics on my scanner, and nothing works. Any help would be greatly appreciated!

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