User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36 Steps to reproduce: - Play any audio or videos, such as youtube Actual results: Browser just crashes Expected results: Audio or video should play without crashing the FF ESR 52 browser

OS: Mac OSx 10.13 Browser: FF ESR 52

[Tracking Requested - why for this release]: Insta-crashes on Youtube This has been reported to us by Apple too and I've gotten confirmation from others in #qa that can also reproduce. Trying to get ahold of a stack. jya mentioned that bug 1376163 might be related here, but the symptoms don't seem to fit.

Julien - possible issue for an ESR dot release. We should likely keep an eye on this.

This is definitely related to sandboxing. I can easily reproduce this crash on a MBP w/ High Sierra and can confirm that changing the security.sandbox.content.level pref from 1 to 0 makes the crashes go away. Frustratingly, about:crashes isn't showing any reports when this hits, though, so I don't have any breakpad links to share :(

I can reproduce the crash on an ESR 52 build. Before the crash I see the same audio sandbox violation as in bug 1376163 and the problem isn't reproducible with the fix for bug 1376163. Closing as a dupe of bug 1376163 which I'll post the ESR patch for shortly. And the crash is in mozilla::AudioStream::OpenCubeb().

Confirmed that I no longer crash with CI builds containing the fix. Looks very promising that next week's ESR 52.4.1 release should fix this for affected users.