Interesting. Quick test result: looks like flipping network.protocol-handler.external.mailto in the firefox config to false prevents this (of course, in the pro

Interesting. Quick test result: looks like flipping network.protocol-handler.external.mailto in the firefox config to false prevents this (of course, in the process, prevents action on mailto links). There's an open bug in regards to this issue: https://bugzilla.mozilla.org/show_bug.cgi?id=566893 https://bugzilla.mozilla.org/show_bug.cgi?id=566893