MacBook Pro (13-inch, 2017) running macOS 10.13.6 (17G5019). I randomly run into a full-machine display lockup when using FF with WR enabled. When this happens I can still move the mouse cursor but can't interact with any windows, switch windows, etc. I suspect that my input is actually being delivered to the windows but it's just the display that doesn't update in response, so possible a GPU lockup.

Today I seem to be able to reproduce it relatively easily while editing a hackmd.io page. The lockup doesn't seem to happen with WR disabled. I'm seeing the problem using both Beta (currently 67.0b5, but saw it on older ones too) and Nightly (currently Apr 1).

P2 because this forces me to reboot when it happens, so I would consider it a ship blocker on mac.

Kats, curious if you have seen this happen again lately?

Nope, haven't seen this recently. Tried repro'ing as well by editing the hackmd page in comment 0 and no lockup.

Re-opening this bug because I am hearing that some folks might still be experiencing this.

JoeH might be experiencing this bug. So far it has only happened when he has been attached to an external monitor over usb-c or maybe switching wifi networks.

Rares - when you are starting to run through WR on Mac, I'd be interested to hear if you ever encounter anything like this issue

Hi, I tried to reproduce this issue on a Macbook with 10.14.6 and an Intel Iris Plus Graphics 640 1536 MB GPU with Firefox Release, Beta, as well as our latest Nightly build but without success, no Freezes or stutters or any issues were found while I was editing that page.

Going to close this again for now as it seems like the newer issue with Joe's computer might be different