I've gotten this a couple times over the last couple months. When I unplug my USBC -> HDMI+USB+Power adapter for my Macbook, Firefox has crashed. Looking at the crash report traces, it seems like the issue is that I have a USB webcam plugged into the USB port of that adapter, and Firefox is trying to query the camera device for information, which is failing.

I use https://appear.in daily so Firefox is often connecting to my Webcam, but this doesn't seem to happen very often, and it hasn't happened when I've actively been on a call. It just seems to happen randomly when I unplug my laptop to take it with me.

Here are the reports:

bp-3a2a3d9c-043d-43b8-8782-f86d30190418
bp-00f62241-0d06-4197-aa7d-8ad140190405
bp-e1dca492-b03e-4375-8494-80e300190226

Seems the content process is asking the parent for camera device info, so we ask CoreFoundation, and it gets very upset with us for asking.

Can you please try using Nightly to verify if it is fixed there or not. Right now it is reported as Release only. It's unlikely that a fix will be accepted in Release.

I generally haven't used Nightly because of the issues I've seen with people losing their open tabs.

Is there a specific change on Nightly that could have fixed this? This issue has only happened to me 3 times over the last 3 months, so I don't know that I'm willing to switch to Nightly fulltime for potentially months to see if the bug still happens. I don't consider the fix a huge priority so I don't care if Release is updated with a fix, I just want to make sure it is tracked and eventually fixed.

There is a good chance that this is fixed by Bug 1519535, which is currently on Beta (landed in Firefox 67). Given the low frequency of the crashes, I don't think there is much point in you testing Beta to see if it is fixed.

The crash stack looks identical, I think I'll actually dup it over to 1519535. Please file a new bug if you see problems once 67 hits release. (I meant to that with the last comment, but I accidentally hit save changes rather than resolve. Sorry about the extra noise).

Sounds good, thanks!