48.0.1

Fix an audio regression impacting some major websites (bug 1295296)
Fix a top crash in the JavaScript engine (Bug 1290469)
Fix a startup crash issue caused by Websense (Bug 1291738)
Fix a different behavior with e10s / non-e10s on <select> and mouse
events (Bug 1291078)
Fix a top crash caused by plugin issues (Bug 1264530)
Fix an unsigned add-ons issue on Windows
Fix a shutdown issue (Bug 1276920)
Fix a crash in WebRTC