Crash ID: bp-c7ff1550-febd-4c01-8c91-93cae2151109
That looks like a problem with AcaTtsSapi5.dll that is part of Acapela Multimedia TTS (MS-SAPI 5.1 Layer for Acapela Multimedia).
- Firefox 42.0 Crash Report [@ @0x0 | acattssapi5.dll@0x3640 ]
If you have this software then disable if for now or uninstall it and contact Acapela for support. You may have other software that includes this component, so you can do a search for the acattssapi5.dll to see to what software it belongs.