This update includes Firefox 48.0.1 to fix a few regressions and a security issue:

* Fix an audio regression impacting some major websites
* Fix a top crash in the JavaScript engine
* Fix a startup crash issue caused by Websense
* Fix a different behavior with e10s / non-e10s on select and mouse events
* Fix a top crash caused by plugin issues
* Fix a shutdown issue
* Fix a crash in WebRTC

- added upstream patch so system plugins/extensions are correctly
loaded again on x86-64
- Fix for possible buffer overrun