SharePoint 2013 and Office Web Apps Firefox Trust Issue when Opening Documents

When using firefox to open PDF's in SharePoint 2013 firefox throws the message "The Connection is Untrusted.  The issuer of the certificate is unknown."  Do I need to do something with importing certificates on the SharePoint servers to have this message go away?  

Please see attached screenshot.

Chrome and IE work just fine.
2015-07-31-Office-Web-App-Untrusted.pdf.
NSPITAsked:
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David Johnson, CD, MVPOwnerCommented:
what did you use to create that .pdf it would not open in adobe reader or firefox and I had to open it in edge browser.

Firefox has their own certificate managerfirefox certificate manager
Who published your website certificate?
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MacroShadowCommented:
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I have recommended this question be closed as follows:

Accept: David Johnson CD MVP (https:#a40908704)

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