Bugzilla

Tried this on Nightly on Linux:
It leads to the following errors (although, screenshot is saved):

./obj-x86_64-pc-linux-gnu/dist/bin/firefox --screenshot about:blank
*** You are running in headless mode.
[GFX1-]: glxtest: VA-API test failed: missing or old libva-drm library.
Screenshot saved to: /home/aiunusov/mozilla-unified/screenshot.png
console.error: (new TypeError("NetworkError: Network request failed", "resource://services-settings/Utils.jsm", 237))
console.error: Region.sys.mjs: "Error fetching region" (new TypeError("NetworkError when attempting to fetch resource.", ""))
console.error: Region.sys.mjs: "Failed to fetch region" (new Error("NO_RESULT", "resource://gre/modules/Region.sys.mjs", 416))

Tried this on Nightly on Linux:
It leads to the following errors (although, screenshot is saved):

>WARNING: Error: Phase "profile-before-change" is finished, it is too late to register completion condition "OS.File: flush I/O queued before profileBeforeChange"
WARNING: addBlocker@resource://gre/modules/AsyncShutdown.sys.mjs:727:15
addBlocker@resource://gre/modules/AsyncShutdown.sys.mjs:523:26
addBlocker@resource://gre/modules/AsyncShutdown.sys.mjs:458:15
setupShutdown@resource://gre/modules/osfile/osfile_async_front.jsm:1548:28
@resource://gre/modules/osfile/osfile_async_front.jsm:1568:16
@resource://gre/modules/osfile.jsm:12:30
@resource://gre/modules/TelemetryStorage.sys.mjs:10:28
_checkPendingPings@resource://gre/modules/TelemetrySend.sys.mjs:863:17
setup@resource://gre/modules/TelemetrySend.sys.mjs:803:18
setup@resource://gre/modules/TelemetrySend.sys.mjs:241:30
setupTelemetry/this._delayedInitTask<@resource://gre/modules/TelemetryControllerParent.sys.mjs:829:36
observe@resource://gre/modules/AsyncShutdown.sys.mjs:576:16
JavaScript error: resource://gre/modules/AsyncShutdown.sys.mjs, line 727: Error: Phase "profile-before-change" is finished, it is too late to register completion condition "OS.File: flush I/O queued before profileBeforeChange"
JavaScript error: resource://gre/modules/AsyncShutdown.sys.mjs, line 727: Error: Phase "profile-before-change" is finished, it is too late to register completion condition "OS.File: flush I/O queued before profileBeforeChange"
JavaScript error: resource://gre/modules/AsyncShutdown.sys.mjs, line 727: Error: Phase "profile-before-change" is finished, it is too late to register completion condition "OS.File: flush I/O queued before profileBeforeChange"
JavaScript error: resource://gre/modules/AsyncShutdown.sys.mjs, line 727: Error: Phase "profile-before-change" is finished, it is too late to register completion condition "OS.File: flush I/O queued before profileBeforeChange"
JavaScript error: resource://gre/modules/AsyncShutdown.sys.mjs, line 727: Error: Phase "profile-before-change" is finished, it is too late to register completion condition "OS.File: flush I/O queued before profileBeforeChange"
JavaScript error: resource://gre/modules/TerminatorTelemetry.jsm, line 89: NS_ERROR_FAILURE: Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsITelemetry.getHistogramById]
JavaScript error: resource://gre/modules/TerminatorTelemetry.jsm, line 89: NS_ERROR_FAILURE: Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsITelemetry.getHistogramById]
JavaScript error: resource://gre/modules/TerminatorTelemetry.jsm, line 89: NS_ERROR_FAILURE: Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsITelemetry.getHistogramById]
[Parent 70971, Main Thread] WARNING: FuncScope not on stack!: file /home/aiunusov/mozilla-unified/dom/canvas/WebGLContext.cpp:1771
[Parent 70971, Main Thread] WARNING: FuncScope not on stack!: file /home/aiunusov/mozilla-unified/dom/canvas/WebGLContext.cpp:1771
[Parent 70971, IPDL Background] WARNING: IPC Connection Error: [Parent][PBackgroundParent] RunMessage(msgname=PRemoteWorkerService::Msg___delete__) Channel closing: too late to send/recv, messages will be lost: file /home/aiunusov/mozilla-unified/ipc/glue/MessageChannel.cpp:1927
[Socket 71047, Main Thread] WARNING: IPC message 'PSocketProcess::Msg_FOGData' discarded: actor cannot send: file /home/aiunusov/mozilla-unified/ipc/glue/ProtocolUtils.cpp:504
[Socket 71047, Main Thread] WARNING: NS_ENSURE_TRUE(Preferences::InitStaticMembers()) failed: file /home/aiunusov/mozilla-unified/modules/libpref/Preferences.cpp:4663
Destroying context 0x7f3857efd040 surface 0x7f3857eb5800 on display 0x7f38616d9800
[Parent 70971, Main Thread] WARNING: Extra shutdown CC: 'i < NORMAL_SHUTDOWN_COLLECTIONS', file /home/aiunusov/mozilla-unified/xpcom/base/nsCycleCollector.cpp:3384
[Parent 70971, Main Thread] WARNING: NS_ENSURE_TRUE(InitStaticMembers()) failed: file /home/aiunusov/mozilla-unified/obj-x86_64-pc-linux-gnu/dist/include/mozilla/Preferences.h:129
[Parent 70971, Main Thread] WARNING: NS_ENSURE_TRUE(Preferences::InitStaticMembers()) failed: file /home/aiunusov/mozilla-unified/modules/libpref/Preferences.cpp:4663