George Yves finjan doesn't work on the latest version of Firefox v3.6.10 please explain your justification claiming that you have Finjan 1.314 installed on Firefox 3.6.10
Trust your eyes if you don't trust my words.
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I didn't modify the install.rdf, nor force installation with the help of other extensions. And you can read about the extension's compatibility on the first screenshot.
No, it looks like the company have consciously modified the xpi file effectively blocking anything higher than firefox 3.0.* as in my image, that is what they are currently serving up right now. When they made this change I don't know, but obviously after you installed/updated it.
Try uninstalling at (not advised if you want to use it) and then try to install what is on the site, your in for a shock it won't work.