I can reproduce by following these steps:
Open Help/About Nightly, download update
Open C:\Program Files\Mozilla Firefox, observe folder named "updated" inside
Application Basics
------------------
Name: Firefox
Version: 55.0a1
Build ID: 20170502030211
Update Channel: nightly
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:55.0) Gecko/20100101 Firefox/55.0
OS: Windows_NT 10.0
Multiprocess Windows: 1/1 (Enabled by default)
Google Key: Found
Mozilla Location Service Key: Found
Safe Mode: false
Crash Reports for the Last 3 Days
---------------------------------
All Crash Reports
Nightly Features
----------------
Name: Activity Stream
Version: 0.0.0
ID: activity-stream@mozilla.org
Name: Application Update Service Helper
Version: 2.0
ID: aushelper@mozilla.org
Name: Firefox Screenshots
Version: 6.3.0
ID: screenshots@mozilla.org
Name: FlyWeb
Version: 1.0.0
ID: flyweb@mozilla.org
Name: Form Autofill
Version: 1.0
ID: formautofill@mozilla.org
Name: Multi-process staged rollout
Version: 1.50
ID: e10srollout@mozilla.org
Name: Pocket
Version: 1.0.5
ID: firefox@getpocket.com
Name: Presentation
Version: 1.0.0
ID: presentation@mozilla.org
Name: Shield Recipe Client
Version: 1.0.0
ID: shield-recipe-client@mozilla.org
Name: Web Compat
Version: 1.1
ID: webcompat@mozilla.org
Name: WebCompat Reporter
Version: 1.0.0
ID: webcompat-reporter@mozilla.org
Extensions
----------
Name: Abduction!
Version: 3.5.0.1-signed.1-signed
Enabled: true
ID: {b0e1b4a6-2c6f-4e99-94f2-8e625d7ae255}
Name: Beyond Australis
Version: 1.4.8
Enabled: true
ID: thefoxonlybetter@quicksaver
Name: Download Manager (S3)
Version: 4.10
Enabled: true
ID: s3download@statusbar
Name: Download Status Bar
Version: 15.0.0.1
Enabled: true
ID: {6c28e999-e900-4635-a39d-b1ec90ba0c0f}
Name: Element Hiding Helper for Adblock Plus
Version: 1.4
Enabled: true
ID: elemhidehelper@adblockplus.org
Name: Forecastfox (fix version)
Version: 2.4.8
Enabled: true
ID: forecastfox@s3_fix_version
Name: Greasemonkey
Version: 3.11
Enabled: true
ID: {e4a8a97b-f2ed-450b-b12d-ee082ba24781}
Name: New Add-on Bar
Version: 0.24
Enabled: true
ID: ausaddonbar@teo.pl
Name: Nightly Tester Tools
Version: 3.9
Enabled: true
ID: {8620c15f-30dc-4dba-a131-7c5d20cf4a29}
Name: Open in IE
Version: 1.5.0.1-signed
Enabled: true
ID: openinie@wittersworld.com
Name: passLikeW8
Version: 0.2.1-signed.1-signed
Enabled: true
ID: jid1-BQiF0h2eHzXeZQ@jetpack
Name: Private Tab
Version: 0.2.1.2
Enabled: true
ID: privateTab@infocatcher
Name: RECAP
Version: 0.9.2.2.1-signed.1-signed
Enabled: true
ID: info@recapthelaw.org
Name: Slim Add-ons Manager
Version: 14.1
Enabled: true
ID: slimaddonmanager@opendfki.de
Name: uBlock Origin
Version: 1.12.1
Enabled: true
ID: uBlock0@raymondhill.net
Name: Unhide Passwords
Version: 1.2.7.0.1-signed.1-signed
Enabled: true
ID: {2e17e2b2-b8d4-4a67-8d7b-fafa6cc9d1d0}
Name: Video DownloadHelper
Version: 6.2.0
Enabled: true
ID: {b9db16a4-6edc-47ec-a1f4-b86292ed211d}
Graphics
--------
Features
Compositing: Direct3D 11
Asynchronous Pan/Zoom: wheel input enabled; scrollbar drag enabled
WebGL 1 Driver WSI Info: EGL_VENDOR: Google Inc. (adapter LUID: 0000000000019679) EGL_VERSION: 1.4 (ANGLE 2.1.0.dec065540d5f) EGL_EXTENSIONS: EGL_EXT_create_context_robustness EGL_ANGLE_d3d_share_handle_client_buffer EGL_ANGLE_d3d_texture_client_buffer EGL_ANGLE_surface_d3d_texture_2d_share_handle EGL_ANGLE_query_surface_pointer EGL_ANGLE_window_fixed_size EGL_ANGLE_keyed_mutex EGL_ANGLE_surface_orientation EGL_ANGLE_direct_composition EGL_NV_post_sub_buffer EGL_KHR_create_context EGL_EXT_device_query EGL_KHR_image EGL_KHR_image_base EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_gl_renderbuffer_image EGL_KHR_get_all_proc_addresses EGL_KHR_stream EGL_KHR_stream_consumer_gltexture EGL_NV_stream_consumer_gltexture_yuv EGL_ANGLE_flexible_surface_compatibility EGL_ANGLE_stream_producer_d3d_texture_nv12 EGL_ANGLE_create_context_webgl_compatibility EGL_CHROMIUM_create_context_bind_generates_resource EGL_EXTENSIONS(nullptr): EGL_EXT_client_extensions EGL_EXT_platform_base EGL_EXT_platform_device EGL_ANGLE_platform_angle EGL_ANGLE_platform_angle_d3d EGL_ANGLE_device_creation EGL_ANGLE_device_creation_d3d11 EGL_ANGLE_experimental_present_path EGL_KHR_client_get_all_proc_addresses
WebGL 1 Driver Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 4600 Direct3D11 vs_5_0 ps_5_0)
WebGL 1 Driver Version: OpenGL ES 2.0 (ANGLE 2.1.0.dec065540d5f)
WebGL 1 Driver Extensions: GL_ANGLE_depth_texture GL_ANGLE_framebuffer_blit GL_ANGLE_framebuffer_multisample GL_ANGLE_instanced_arrays GL_ANGLE_lossy_etc_decode GL_ANGLE_pack_reverse_row_order GL_ANGLE_request_extension GL_ANGLE_robust_client_memory GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_ANGLE_texture_usage GL_ANGLE_translated_shader_source GL_CHROMIUM_bind_generates_resource GL_CHROMIUM_bind_uniform_location GL_CHROMIUM_copy_compressed_texture GL_CHROMIUM_copy_texture GL_CHROMIUM_sync_query GL_EXT_blend_minmax GL_EXT_color_buffer_half_float GL_EXT_debug_marker GL_EXT_discard_framebuffer GL_EXT_disjoint_timer_query GL_EXT_draw_buffers GL_EXT_frag_depth GL_EXT_map_buffer_range GL_EXT_occlusion_query_boolean GL_EXT_read_format_bgra GL_EXT_robustness GL_EXT_sRGB GL_EXT_shader_texture_lod GL_EXT_texture_compression_dxt1 GL_EXT_texture_filter_anisotropic GL_EXT_texture_format_BGRA8888 GL_EXT_texture_rg GL_EXT_texture_storage GL_EXT_unpack_subimage GL_KHR_debug GL_NV_EGL_stream_consumer_external GL_NV_fence GL_NV_pack_subimage GL_NV_pixel_buffer_object GL_OES_EGL_image GL_OES_EGL_image_external GL_OES_compressed_ETC1_RGB8_texture GL_OES_depth32 GL_OES_element_index_uint GL_OES_get_program_binary GL_OES_mapbuffer GL_OES_packed_depth_stencil GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_texture_float GL_OES_texture_float_linear GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_npot GL_OES_vertex_array_object
WebGL 1 Extensions: ANGLE_instanced_arrays EXT_blend_minmax EXT_color_buffer_half_float EXT_frag_depth EXT_shader_texture_lod EXT_texture_filter_anisotropic EXT_disjoint_timer_query MOZ_debug OES_element_index_uint OES_standard_derivatives OES_texture_float OES_texture_float_linear OES_texture_half_float OES_texture_half_float_linear OES_vertex_array_object WEBGL_color_buffer_float WEBGL_compressed_texture_s3tc WEBGL_debug_renderer_info WEBGL_debug_shaders WEBGL_depth_texture WEBGL_draw_buffers WEBGL_lose_context MOZ_WEBGL_lose_context MOZ_WEBGL_compressed_texture_s3tc MOZ_WEBGL_depth_texture
WebGL 2 Driver WSI Info: EGL_VENDOR: Google Inc. (adapter LUID: 0000000000019679) EGL_VERSION: 1.4 (ANGLE 2.1.0.dec065540d5f) EGL_EXTENSIONS: EGL_EXT_create_context_robustness EGL_ANGLE_d3d_share_handle_client_buffer EGL_ANGLE_d3d_texture_client_buffer EGL_ANGLE_surface_d3d_texture_2d_share_handle EGL_ANGLE_query_surface_pointer EGL_ANGLE_window_fixed_size EGL_ANGLE_keyed_mutex EGL_ANGLE_surface_orientation EGL_ANGLE_direct_composition EGL_NV_post_sub_buffer EGL_KHR_create_context EGL_EXT_device_query EGL_KHR_image EGL_KHR_image_base EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_gl_renderbuffer_image EGL_KHR_get_all_proc_addresses EGL_KHR_stream EGL_KHR_stream_consumer_gltexture EGL_NV_stream_consumer_gltexture_yuv EGL_ANGLE_flexible_surface_compatibility EGL_ANGLE_stream_producer_d3d_texture_nv12 EGL_ANGLE_create_context_webgl_compatibility EGL_CHROMIUM_create_context_bind_generates_resource EGL_EXTENSIONS(nullptr): EGL_EXT_client_extensions EGL_EXT_platform_base EGL_EXT_platform_device EGL_ANGLE_platform_angle EGL_ANGLE_platform_angle_d3d EGL_ANGLE_device_creation EGL_ANGLE_device_creation_d3d11 EGL_ANGLE_experimental_present_path EGL_KHR_client_get_all_proc_addresses
WebGL 2 Driver Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 4600 Direct3D11 vs_5_0 ps_5_0)
WebGL 2 Driver Version: OpenGL ES 3.0 (ANGLE 2.1.0.dec065540d5f)
WebGL 2 Driver Extensions: GL_ANGLE_depth_texture GL_ANGLE_framebuffer_blit GL_ANGLE_framebuffer_multisample GL_ANGLE_instanced_arrays GL_ANGLE_lossy_etc_decode GL_ANGLE_pack_reverse_row_order GL_ANGLE_request_extension GL_ANGLE_robust_client_memory GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_ANGLE_texture_usage GL_ANGLE_translated_shader_source GL_CHROMIUM_bind_generates_resource GL_CHROMIUM_bind_uniform_location GL_CHROMIUM_copy_compressed_texture GL_CHROMIUM_copy_texture GL_CHROMIUM_sync_query GL_EXT_blend_minmax GL_EXT_color_buffer_float GL_EXT_color_buffer_half_float GL_EXT_debug_marker GL_EXT_discard_framebuffer GL_EXT_disjoint_timer_query GL_EXT_draw_buffers GL_EXT_frag_depth GL_EXT_map_buffer_range GL_EXT_occlusion_query_boolean GL_EXT_read_format_bgra GL_EXT_robustness GL_EXT_sRGB GL_EXT_shader_texture_lod GL_EXT_texture_compression_dxt1 GL_EXT_texture_filter_anisotropic GL_EXT_texture_format_BGRA8888 GL_EXT_texture_norm16 GL_EXT_texture_rg GL_EXT_texture_storage GL_EXT_unpack_subimage GL_KHR_debug GL_NV_EGL_stream_consumer_external GL_NV_fence GL_NV_pack_subimage GL_NV_pixel_buffer_object GL_OES_EGL_image GL_OES_EGL_image_external GL_OES_EGL_image_external_essl3 GL_OES_compressed_ETC1_RGB8_texture GL_OES_depth32 GL_OES_element_index_uint GL_OES_get_program_binary GL_OES_mapbuffer GL_OES_packed_depth_stencil GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_texture_float GL_OES_texture_float_linear GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_npot GL_OES_vertex_array_object
WebGL 2 Extensions: EXT_color_buffer_float EXT_texture_filter_anisotropic EXT_disjoint_timer_query MOZ_debug OES_texture_float_linear WEBGL_compressed_texture_s3tc WEBGL_debug_renderer_info WEBGL_debug_shaders WEBGL_lose_context MOZ_WEBGL_lose_context MOZ_WEBGL_compressed_texture_s3tc
Audio Backend: wasapi
Direct2D: true
DirectWrite: true (10.0.15063.0)
GPU #1
Active: Yes
Description: Intel(R) HD Graphics 4600
Vendor ID: 0x8086
Device ID: 0x0416
Driver Version: 20.19.15.4531
Driver Date: 9-29-2016
Drivers: igdumdim64 igd10iumd64 igd10iumd64 igd12umd64 igdumdim32 igd10iumd32 igd10iumd32 igd12umd32
Subsys ID: 05be1028
RAM: Unknown
Diagnostics
ClearType Parameters: Gamma: 2.2 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 400
AzureCanvasAccelerated: 0
AzureCanvasBackend: Direct2D 1.1
AzureCanvasBackend (UI Process): skia
AzureContentBackend: Direct2D 1.1
AzureContentBackend (UI Process): skia
AzureFallbackCanvasBackend (UI Process): cairo
GPUProcessPid: 11364
GPUProcess: Terminate GPU Process
ClearType Parameters: Gamma: 2.2 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 400
Decision Log
WEBRENDER:
opt-in by default: WebRender is an opt-in feature
Important Modified Preferences
------------------------------
accessibility.typeaheadfind.flashBar: 0
browser.cache.disk.capacity: 358400
browser.cache.disk.filesystem_reported: 1
browser.cache.disk.smart_size.first_run: false
browser.cache.frecency_experiment: 1
browser.download.folderList: 0
browser.download.importedFromSqlite: true
browser.places.smartBookmarksVersion: 8
browser.sessionstore.upgradeBackup.latestBuildID: 20170502030211
browser.startup.homepage_override.buildID: 20170502030211
browser.startup.homepage_override.mstone: 55.0a1
browser.tabs.crashReporting.includeURL: true
browser.urlbar.maxRichResults: 12
browser.urlbar.suggest.searches: true
dom.gamepad.extensions.enabled: true
dom.push.userAgentID: 9115ca0ebfdd443f9a1872ddee24df4c
extensions.lastAppVersion: 55.0a1
media.benchmark.vp9.fps: 118
media.benchmark.vp9.versioncheck: 2
media.gmp-gmpopenh264.abi: x86_64-msvc-x64
media.gmp-gmpopenh264.lastUpdate: 1493225973
media.gmp-gmpopenh264.version: 1.6
media.gmp-manager.buildID: 20170502030211
media.gmp-manager.lastCheck: 1493820494
media.gmp-widevinecdm.abi: x86_64-msvc-x64
media.gmp-widevinecdm.lastUpdate: 1493225976
media.gmp-widevinecdm.version: 1.4.8.903
media.gmp.storage.version.observed: 1
media.hardware-video-decoding.failed: false
network.cookie.prefsMigrated: true
network.dns.disablePrefetch: true
network.http.speculative-parallel-limit: 0
network.predictor.cleaned-up: true
network.prefetch-next: false
places.database.lastMaintenance: 1493306424
places.history.expiration.transient_current_max_pages: 136475
plugin.disable_full_page_plugin_for_types: application/pdf
print.printer_Foxit_Reader_PDF_Printer.print_bgcolor: false
print.printer_Foxit_Reader_PDF_Printer.print_bgimages: false
print.printer_Foxit_Reader_PDF_Printer.print_duplex: -437918235
print.printer_Foxit_Reader_PDF_Printer.print_edge_bottom: 0
print.printer_Foxit_Reader_PDF_Printer.print_edge_left: 0
print.printer_Foxit_Reader_PDF_Printer.print_edge_right: 0
print.printer_Foxit_Reader_PDF_Printer.print_edge_top: 0
print.printer_Foxit_Reader_PDF_Printer.print_evenpages: true
print.printer_Foxit_Reader_PDF_Printer.print_footercenter:
print.printer_Foxit_Reader_PDF_Printer.print_footerleft: &PT
print.printer_Foxit_Reader_PDF_Printer.print_footerright: &D
print.printer_Foxit_Reader_PDF_Printer.print_headercenter:
print.printer_Foxit_Reader_PDF_Printer.print_headerleft: &T
print.printer_Foxit_Reader_PDF_Printer.print_headerright: &U
print.printer_Foxit_Reader_PDF_Printer.print_in_color: true
print.printer_Foxit_Reader_PDF_Printer.print_margin_bottom: 0.5
print.printer_Foxit_Reader_PDF_Printer.print_margin_left: 0.5
print.printer_Foxit_Reader_PDF_Printer.print_margin_right: 0.5
print.printer_Foxit_Reader_PDF_Printer.print_margin_top: 0.5
print.printer_Foxit_Reader_PDF_Printer.print_oddpages: true
print.printer_Foxit_Reader_PDF_Printer.print_orientation: 0
print.printer_Foxit_Reader_PDF_Printer.print_page_delay: 50
print.printer_Foxit_Reader_PDF_Printer.print_paper_data: 256
print.printer_Foxit_Reader_PDF_Printer.print_paper_height: 11.00
print.printer_Foxit_Reader_PDF_Printer.print_paper_name:
print.printer_Foxit_Reader_PDF_Printer.print_paper_size_unit: 0
print.printer_Foxit_Reader_PDF_Printer.print_paper_width: 8.50
print.printer_Foxit_Reader_PDF_Printer.print_resolution: 300
print.printer_Foxit_Reader_PDF_Printer.print_reversed: false
print.printer_Foxit_Reader_PDF_Printer.print_scaling: 1.00
print.printer_Foxit_Reader_PDF_Printer.print_shrink_to_fit: true
print.printer_Foxit_Reader_PDF_Printer.print_to_file: false
print.printer_Foxit_Reader_PDF_Printer.print_unwriteable_margin_bottom: 0
print.printer_Foxit_Reader_PDF_Printer.print_unwriteable_margin_left: 0
print.printer_Foxit_Reader_PDF_Printer.print_unwriteable_margin_right: 0
print.printer_Foxit_Reader_PDF_Printer.print_unwriteable_margin_top: 0
security.sandbox.content.tempDirSuffix: {570d44b9-4b51-4e66-a63f-e2730b04dd84}
services.sync.declinedEngines: tabs
services.sync.engine.bookmarks.validation.lastTime: 1493813900
services.sync.engine.greasemonkey: true
services.sync.engine.prefs.modified: false
services.sync.engine.tabs: false
services.sync.lastPing: 1493813896
services.sync.lastSync: Wed May 03 2017 11:20:20 GMT-0400 (Eastern Standard Time)
storage.vacuum.last.index: 1
storage.vacuum.last.places.sqlite: 1493306417
ui.osk.debug.keyboardDisplayReason: IKPOS: Touch screen not found.
Important Locked Preferences
----------------------------
Places Database
---------------
JavaScript
----------
Incremental GC: true
Accessibility
-------------
Activated: false
Prevent Accessibility: 0
Library Versions
----------------
NSPR
Expected minimum version: 4.15 Beta
Version in use: 4.15 Beta
NSS
Expected minimum version: 3.31 Beta
Version in use: 3.31 Beta
NSSSMIME
Expected minimum version: 3.31 Beta
Version in use: 3.31 Beta
NSSSSL
Expected minimum version: 3.31 Beta
Version in use: 3.31 Beta
NSSUTIL
Expected minimum version: 3.31 Beta
Version in use: 3.31 Beta
Experimental Features
---------------------
Sandbox
-------
Content Process Sandbox Level: 2
