[Bug 1929598] Re: Firefox rfuses to start YouTube display

[BertN45]

It happened again and it happened while I queued a number of video.

The messages displayed were:

Sandbox: attempt to open unexpected file /sys/devices/system/cpu/online
Sandbox: attempt to open unexpected file /proc/stat
Sandbox: attempt to open unexpected file /proc/net/unix
Sandbox: attempt to open unexpected file /proc/self/maps
Sandbox: attempt to open unexpected file /proc/net/unix

(firefox:1428435): GLib-GObject-WARNING **: 23:44:55.801:
g_object_get_is_valid_property: object class 'GdkX11DeviceCore' has no
property named 'device-id'

(firefox:1428435): GLib-GObject-WARNING **: 23:45:21.546:
g_object_get_is_valid_property: object class 'GdkX11DeviceCore' has no
property named 'device-id'

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Title:
  Firefox rfuses to start YouTube display

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