I assume you mean 55? I would try using mozregression and see if you can track it down when it happened.
http://mozilla.github.io/mozregression/install.html that might give us an idea... Mike Kaply On Wed, May 17, 2017 at 11:53 AM, Gary Baker <[email protected]> wrote: > Verified that MIME type added locally in FF 45.9 ESR to handle ".stp" > files works. Firefox performs the action specified by the user in the > "Applications" menu. > > After Upgrade to 51.1 ESR the MIME type addition no longer works. The file > type is still in the "Applications" list (and mimeTypes.rdf file) for the > particular file type in question, but it is displayed in a new browser tab > as plain text. > > Rolling same system back to 45.9 ESR brings back the proper handling. > > RDF description from mimeTypes.rdf: > > <RDF:Description RDF:about="urn:mimetype:application/step" > NC:value="application/step" > NC:editable="true" > NC:fileExtensions="stp" > NC:description="DirectModel Document (.stp)"> > <NC:handlerProp RDF:resource="urn:mimetype:handler:application/step"/> > </RDF:Description> > > Does anyone know what happened here? Is this a bug or a "feature" ?? > > Thanks for your help, > Gary Baker > Walker Tool & Die, Inc > > > _______________________________________________ > Enterprise mailing list > [email protected] > https://mail.mozilla.org/listinfo/enterprise > > To unsubscribe from this list, please visit https://mail.mozilla.org/ > listinfo/enterprise or send an email to [email protected] > with a subject of "unsubscribe" >
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