I'm getting this message in Firefox browser console: "Signature Verification Error: the signature on this .jar archive is invalid because the certificate used to sign this file has an unrecognized issuer." It's very strange because I've used this certificate in previous version of Firefox and my extension was recognized as signed. My current Firefox version is 38.0.5.
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There are multiple possibilities for this. Without more information, it is not possible to narrow down exactly what is causing your issue. What CA are you using, OS, what was the last version of Firefox in which it worked, etc.?
Bug fixes:
For instance, it could be that the following bugs were fixed:
Other certificate related bugs fixed:
Overall change to extension signing:
It could also be that the reason for this is that Mozilla has changed/is changing to requiring all extensions to be signed through addons.mozilla.org (AMO). Self signing will no longer be acceptable unless explicitly enabled within Firefox. The reason for this change is to "protect users from malware and extensions that haven't been reviewed."
As of this point, all extensions that have been reviewed on AMO have been signed. This occurred on or around 2015-05-28. It is possible that one change in Firefox was to require that the issuer of all certificates be AMO. I did not see that this change had been implemented in 38.0.5, but I do expect that it will be a requirement. When it is, an error such as you have reported would be generated and the extension not be permitted to be installed (unless checking for signing has been disabled). I was under the impression that this was supposed to be enabled as of Firefox 40, but some portion of it may have made it into 38.0.5 and be causing your issue.
AMO sent out the following email to add-on developers in late May: