Client Cert frequently times out talking to postfix and dovecot
Up through Thunderbird 142 everything was working great. Starting with 143, I get frequent "client didn't present a certificate" errors, but the next attempt will work (or not). I didn't report it, hoping that 144 would fix it. It didn't, and I've also updated to 144.0.1, still no joy.
I am running Thunderbird on Arch Linux. I am connecting to a postfix/dovecot back end that I control on Ubuntu 24.04. I have made numerous tweaks to various SSL/TLS settings on each side (some of which seemed to lessen the frequency, but not resolve the issue), so I reverted nearly all of the changes.
The issue occurs whether I am in Thunderbird trouble-shooting mode (safe mode) or not. I also cleared the startup cache which made no difference. I am including server output from when I was in trouble-shooting mode, as well as a dump from trouble-shooting mode from Thunderbird.
According to AI (I know, shoot me...), the issue occurs because Thunderbird is insisting on cached TLS connections in TLSv1.3 no matter what settings I have, and dovecot isn't handling it well. I have tried forcing TLSv1.2 only, which is one of the things that made the problem less frequent, but it still didn't go away completely.
I apologize for the formatting in advance, but I don't see any way to upload a file (other than an image?) or create a code block. I'll happily fix this if someone lets me know the correct way to handle this...
Here is the output from dovecot on the server:
Oct 20 10:12:23 imap-login: Info: Login: user=<XXX>, method=PLAIN, rip=192.168.100.2, lip=192.168.100.1, mpid=945421, TLS, session=<Q4IQrJdBsOrAqGQC> Oct 20 10:12:33 imap-login: Info: Login: user=<XXX>, method=PLAIN, rip=192.168.100.2, lip=192.168.100.1, mpid=945436, TLS, session=<i8K1rJdBIsXAqGQC> Oct 20 10:12:35 imap-login: Info: Login: user=<YYY>, method=PLAIN, rip=192.168.100.2, lip=192.168.100.1, mpid=945438, TLS, session=<Oc7VrJdBQovAqGQC> Oct 20 10:14:35 pop3-login: Info: Login: user=<ZZZ>, method=PLAIN, rip=192.168.100.2, lip=192.168.100.1, mpid=945590, TLS, session=<Olzvs5dBcpPAqGQC> Oct 20 10:17:28 pop3-login: Info: Login: user=<ZZZ>, method=PLAIN, rip=192.168.100.2, lip=192.168.100.1, mpid=945770, TLS, session=<0vxBvpdBCNzAqGQC> Oct 20 10:21:20 pop3-login: Info: Login: user=<ZZZ>, method=PLAIN, rip=192.168.100.2, lip=192.168.100.1, mpid=946000, TLS, session=<dAsezJdBVMXAqGQC> Oct 20 10:25:01 pop3-login: Info: Disconnected: Connection closed (client didn't send a cert): user=<>, rip=192.168.100.2, lip=192.168.100.1, TLS handshaking: Connection closed, session=<bJVJ2ZdBppPAqGQC> Oct 20 10:28:08 pop3-login: Info: Disconnected: Connection closed (client didn't send a cert): user=<>, rip=192.168.100.2, lip=192.168.100.1, TLS handshaking: Connection closed, session=<K/dw5JdBqpzAqGQC> Oct 20 10:31:11 pop3-login: Info: Disconnected: Connection closed (client didn't send a cert): user=<>, rip=192.168.100.2, lip=192.168.100.1, TLS handshaking: Connection closed, session=<Z0lZ75dB8rPAqGQC> Oct 20 10:34:06 pop3-login: Info: Disconnected: Connection closed (client didn't send a cert): user=<>, rip=192.168.100.2, lip=192.168.100.1, TLS handshaking: Connection closed, session=<uZC8+ZdBvpXAqGQC>
And here the much longer output from the trouble-shooting dump. I have sanitized the user names and server names, but nothing else was touched:
Application Basics
Name: Thunderbird Version: 144.0.1 Build ID: 20251017171753 Distribution ID: archlinux User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:144.0) Gecko/20100101 Thunderbird/144.0.1 OS: Linux 6.17.3-arch2-1 #1 SMP PREEMPT_DYNAMIC Fri, 17 Oct 2025 13:29:06 +0000 OS Theme: Adwaita / Adwaita
Multiprocess Windows: 0/0
Fission Windows: 0/0
Enabled by default
Remote Processes: 2
Enterprise Policies: Inactive
Google Location Service Key: Found
Google Safebrowsing Key: Found
Mozilla Location Service Key: Found
Safe Mode: true
Memory Size (RAM): 60.6 GB
Disk Space Available: 883 GB
Mail and News Accounts
account1:
INCOMING: account1, , (none) Local Folders, plain, passwordCleartext
account2:
INCOMING: account2, , (nntp) news.gmane.org:119, plain, passwordCleartext
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, true
account3:
INCOMING: account3, , (rss) Feeds, plain, passwordCleartext
account4:
INCOMING: account4, , (pop3) 192.168.100.1:995, SSL, passwordCleartext
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, true
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, false
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, false
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, false
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, false
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, false
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, false
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, false
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, false
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, false
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, false
account6:
INCOMING: account6, , (imap) imap.googlemail.com:993, SSL, passwordCleartext
OUTGOING: , smtp.googlemail.com:465, SSL, passwordCleartext, true
account7:
INCOMING: account7, , (pop3) test.com:110, alwaysSTARTTLS, passwordCleartext
OUTGOING: , smtp.gmail.com:587, alwaysSTARTTLS, passwordCleartext, true
account12:
INCOMING: account12, , (imap) 192.168.100.1:993, SSL, passwordCleartext
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, true
account16:
INCOMING: account16, , (imap) 192.168.100.1:993, SSL, passwordCleartext
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, true
account17:
INCOMING: account17, , (imap) 192.168.100.1:993, SSL, passwordCleartext
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, true
Libraries
Library
Status
Expected minimum version
Version in use
Path
RNP (OpenPGP)
OK
0.17.1
0.17.1.MZLA.144.0.1.botan
/usr/lib/thunderbird/librnp.so
OTR
Failed to load. OTR chat encryption will not work.
-
-
-
Calendar Settings
XYZ
Name
Value
Name:
Type: gdata
Disabled: true
Username:
URI:
Refresh Interval: 30
Read-only: false
Suppress Alarms: false
Cache Enabled: false
iMIP Identity:
iMIP Disabled:
iMIP Account:
Organizer Id:
Force Email Scheduling:
Popup Alarms Supported:
Alarms on Invitation Supported:
Max Alarms Per Event:
Attachment Supported:
Max Categories:
Privacy State Supported:
Priority Supported:
Event Supported:
Task Supported:
Local Time Supported:
UTC/GMT Supported:
Auto-Scheduling Supported:
Remote Processes
Type: Count
RDD: 1
Isolated Web Content: 1
Add-ons
Name
Type
Version
Enabled
Location
ID
Amazon.com extension 1.1 true app-builtin amazondotcom@search.mozilla.org
Bing
extension
1.0
true
app-builtin
bing@search.mozilla.org
DuckDuckGo
extension
1.0
true
app-builtin
ddg@search.mozilla.org
Google
extension
1.0
true
app-builtin
google@search.mozilla.org
Wikipedia (en)
extension
1.0
true
app-builtin
wikipedia@search.mozilla.org
Dark
theme
1.3.1
true
app-builtin
thunderbird-compact-dark@mozilla.org
United States English Spellchecker
dictionary
8.1
false
app-profile
en-US@dictionaries.addons.mozilla.org
CardBook
extension
101.3
false
app-profile
cardbook@vigneau.philippe
Dark Reader
extension
4.9.68
false
app-profile
addon@darkreader.org
Darko
extension
3.9
false
app-profile
admin@fastaddons.com_Darko
ImportExportTools NG
extension
14.1.14
false
app-profile
ImportExportToolsNG@cleidigh.kokkini.net
Markdown Here Revival
extension
4.0.7
false
app-profile
markdown-here-revival@xul.calypsoblue.org
Monterail Full Dark
extension
3.3
false
app-profile
MonterailFullDark2@conema.me
Provider for Google Calendar
extension
128.5.7
false
app-profile
{a62ef8ec-5fdc-40c2-873c-223b8a6925cc}
Todoist for Thunderbird: To-Do list and Task Manager
extension
4.3
false
app-profile
{88f55c90-a688-11e1-b3dd-0800200c9a66}
Light
theme
1.3.1
false
app-builtin
thunderbird-compact-light@mozilla.org
System theme — auto
theme
1.4.2
false
app-builtin
default-theme@mozilla.org
Security Software
Type: Name
Antivirus:
Antispyware:
Firewall:
Legacy User Stylesheets
Active: true Stylesheets: userContent.css
Graphics
Features
Compositing: WebRender (Software)
Font Visibility Debug Info: Linux Unknown - ID=arch
Asynchronous Pan/Zoom: wheel input enabled; scrollbar drag enabled; keyboard enabled; autoscroll enabled; smooth pinch-zoom enabled
WebGL 1 Driver WSI Info: -
WebGL 1 Driver Renderer: WebGL is currently disabled.
WebGL 1 Driver Version: -
WebGL 1 Driver Extensions: -
WebGL 1 Extensions: -
WebGL 2 Driver WSI Info: -
WebGL 2 Driver Renderer: WebGL is currently disabled.
WebGL 2 Driver Version: -
WebGL 2 Driver Extensions: -
WebGL 2 Extensions: -
Window Protocol: wayland
Desktop Environment: sway
Target Frame Rate: 60
GPU #1
Active: Yes
Description: AMD Radeon 780M Graphics (radeonsi, phoenix, LLVM 20.1.8, DRM 3.64, 6.17.3-arch2-1)
Vendor ID: 0x1002
Device ID: 0x15bf
Driver Vendor: mesa/radeonsi
Driver Version: 25.2.4.0
RAM: 0
GPU #2
Diagnostics
AzureCanvasBackend: skia
AzureContentBackend: skia
AzureFallbackCanvasBackend: skia
CMSOutputProfile: Empty profile data
Display0: 3840x2160@60Hz scales:1.000000|1.000000
DisplayCount: 1
Window Device Pixel Ratios: 1
Font Visibility Debug Info: Linux Unknown - ID=arch
WebGPU Default Adapter: [object Object]
WebGPU Fallback Adapter: [object Object]
Decision Log
HW_COMPOSITING: available by defaultblocked by runtime: Acceleration blocked by safe-mode
OPENGL_COMPOSITING: unavailable by default: Hardware compositing is disabled
WEBRENDER: available by defaultunavailable-in-safe-mode by runtime: Safe-mode is enabled
WEBRENDER_COMPOSITOR: disabled by default: Disabled by defaultblocklisted by env: Blocklisted by gfxInfo
WEBRENDER_PARTIAL: available by default
WEBRENDER_SHADER_CACHE: disabled by default: Disabled by defaultunavailable by runtime: WebRender disabled
WEBRENDER_OPTIMIZED_SHADERS: available by defaultunavailable by runtime: WebRender disabled
WEBRENDER_ANGLE: available by defaultunavailable by env: OS not supported
WEBRENDER_DCOMP_PRESENT: available by defaultdisabled by user: User disabled via prefunavailable by env: Requires GPU processunavailable by runtime: Requires ANGLE
WEBRENDER_SCISSORED_CACHE_CLEARS: available by default
WEBGPU: available by default
X11_EGL: available by default
DMABUF: available by default
HARDWARE_VIDEO_DECODING: available by default
HARDWARE_VIDEO_ENCODING: available by default
HW_DECODED_VIDEO_ZERO_COPY: available by default
VP8_HW_DECODE: available by defaultBlocklisted; failure code BLOCKLIST_FEATURE_FAILURE_VIDEO_DECODING_MISSING
VP9_HW_DECODE: available by default
DMABUF_SURFACE_EXPORT: available by defaultblocked by env: Blocklisted by gfxInfo
BACKDROP_FILTER: available by default
CANVAS_RENDERER_THREAD: available by default
ACCELERATED_CANVAS2D: available by defaultblocked by env: Disabled by Software WebRender
H264_HW_DECODE: available by default
AV1_HW_DECODE: available by default
HEVC_HW_DECODE: available by default
REMOTE_CANVAS: disabled by default: Disabled via prefunavailable-no-gpu-process by env: Disabled without GPU processblocked by runtime: Platform not supported
DMABUF_WEBGL: available by default
VP8_HW_ENCODE: available by defaultBlocklisted; failure code BLOCKLIST_FEATURE_FAILURE_VIDEO_ENCODING_MISSING
VP9_HW_ENCODE: available by defaultBlocklisted; failure code BLOCKLIST_FEATURE_FAILURE_VIDEO_ENCODING_MISSING
H264_HW_ENCODE: available by default
AV1_HW_ENCODE: available by default
HEVC_HW_ENCODE: available by default
GL_NORM16_TEXTURES: available by default
WEBGPU_EXTERNAL_TEXTURE: disabled by default: Disabled by defaultblocked by runtime: WebGPU external textures are not supported on this Operating Sy
Crash Guard Disabled Features
Workarounds
Failure Log
(#0) Error: RenderCompositorSWGL failed mapping default framebuffer, no dt
Media
Audio Backend: pulse-rust
Max Channels: 2
Preferred Sample Rate: 48000
Roundtrip latency (standard deviation): 96.96ms (20.22)
Output Devices
Name
Group
Vendor
State
Preferred
Format
Channels
Rate
Latency
Radeon High Definition Audio Controller [Rembrandt/Strix] Digital Stereo (HDMI)
/devices/pci0000:00/0000:00:08.1/0000:c5:00.1/sound/card0
Advanced Micro Devices, Inc. [AMD/ATI]
Enabled
None
default: F32LE, support: S16LE S16BE F32LE F32BE
2
default: 48000, support: 1 - 384000
0 - 0
KM_B2 Digital Audio Analog Stereo
/devices/pci0000:00/0000:00:08.3/0000:c7:00.4/usb7/7-1/7-1.2/7-1.2:1.0/sound/card2
Intel Corp.
Enabled
All
default: S16LE, support: S16LE S16BE F32LE F32BE
2
default: 48000, support: 1 - 384000
0 - 0
Input Devices
Name
Group
Vendor
State
Preferred
Format
Channels
Rate
Latency
Monitor of Radeon High Definition Audio Controller [Rembrandt/Strix] Digital Stereo (HDMI)
/devices/pci0000:00/0000:00:08.1/0000:c5:00.1/sound/card0
Advanced Micro Devices, Inc. [AMD/ATI]
Enabled
None
default: F32LE, support: S16LE S16BE F32LE F32BE
2
default: 48000, support: 1 - 384000
0 - 0
1080P USB Camera Pro
/devices/pci0000:00/0000:00:08.1/0000:c5:00.3/usb1/1-1/1-1.1/1-1.1:1.2/sound/card3
SN0002
Enabled
None
default: S16LE, support: S16LE S16BE F32LE F32BE
1
default: 16000, support: 1 - 384000
0 - 0
Family 17h/19h/1ah HD Audio Controller Analog Stereo
/devices/pci0000:00/0000:00:08.1/0000:c5:00.6/sound/card1
Advanced Micro Devices, Inc. [AMD]
Enabled
All
default: F32LE, support: S16LE S16BE F32LE F32BE
2
default: 48000, support: 1 - 384000
0 - 0
Monitor of KM_B2 Digital Audio Analog Stereo
/devices/pci0000:00/0000:00:08.3/0000:c7:00.4/usb7/7-1/7-1.2/7-1.2:1.0/sound/card2
Intel Corp.
Enabled
None
default: S16LE, support: S16LE S16BE F32LE F32BE
2
default: 48000, support: 1 - 384000
0 - 0
KM_B2 Digital Audio Mono
/devices/pci0000:00/0000:00:08.3/0000:c7:00.4/usb7/7-1/7-1.2/7-1.2:1.0/sound/card2
Intel Corp.
Enabled
None
default: S16LE, support: S16LE S16BE F32LE F32BE
1
default: 48000, support: 1 - 384000
0 - 0
Media Capabilities
Enumerate database
Environment Variables
DISPLAY: :0 GDK_BACKEND: wayland MOZ_ASSUME_USER_NS: 1 MOZ_LAUNCHED_CHILD: MOZ_APP_SILENT_START: XRE_PROFILE_PATH: XRE_PROFILE_LOCAL_PATH: XRE_START_OFFLINE: XRE_BINARY_PATH: XRE_RESTARTED_BY_PROFILE_MANAGER: MOZ_SAFE_MODE_RESTART: MOZ_APP_RESTART: 1
Important Modified Preferences
accessibility.typeaheadfind.flashBar: 0 browser.cache.disk.amount_written: 509526 browser.cache.disk.capacity: 1048576 browser.cache.disk.filesystem_reported: 1 browser.cache.disk.hashstats_reported: 1 browser.cache.disk.smart_size_cached_value: 358400 browser.cache.disk.smart_size.first_run: false browser.cache.disk.smart_size.use_old_max: false browser.cache.disk.telemetry_report_ID: 3 browser.display.screen_resolution: 96 browser.display.use_document_fonts: 0 browser.search.region: US extensions.lastAppVersion: 144.0.1 font.internaluseonly.changed: false font.language.group: x-western font.name.monospace.el: Consolas font.name.monospace.tr: Consolas font.name.monospace.x-baltic: Consolas font.name.monospace.x-central-euro: Consolas font.name.monospace.x-cyrillic: Consolas font.name.monospace.x-unicode: Consolas font.name.monospace.x-western: Consolas font.name.sans-serif.el: Calibri font.name.sans-serif.tr: Calibri font.name.sans-serif.x-baltic: Calibri font.name.sans-serif.x-central-euro: Calibri font.name.sans-serif.x-cyrillic: Calibri font.name.sans-serif.x-unicode: Calibri font.name.sans-serif.x-western: DejaVu Sans Mono font.name.serif.el: Cambria font.name.serif.tr: Cambria font.name.serif.x-baltic: Cambria font.name.serif.x-central-euro: Cambria font.name.serif.x-cyrillic: Cambria font.name.serif.x-unicode: Cambria font.name.serif.x-western: Cambria font.size.fixed.el: 14 font.size.fixed.tr: 14 font.size.fixed.x-baltic: 14 font.size.fixed.x-central-euro: 14 font.size.fixed.x-cyrillic: 14 font.size.fixed.x-unicode: 14 font.size.fixed.x-western: 14 font.size.monospace.x-unicode: 20 font.size.monospace.x-western: 20 font.size.variable.el: 17 font.size.variable.tr: 17 font.size.variable.x-baltic: 17 font.size.variable.x-central-euro: 17 font.size.variable.x-cyrillic: 17 font.size.variable.x-unicode: 20 font.size.variable.x-western: 20 idle.lastDailyNotification: 1760969776 media.gmp.storage.version.observed: 1 network.cookie.CHIPS.lastMigrateDatabase: 2 network.cookie.cookieBehavior: 1 network.cookie.prefsMigrated: true network.predictor.cleaned-up: true network.ssl_tokens_cache_records_per_entry: 10 network.trr.blocklist_cleanup_done: true places.database.lastMaintenance: 1760969776 places.history.expiration.transient_current_max_pages: 115823 plugin.flash.arch: x86_64-gcc3 plugin.flash.blockliststate: 0 plugin.flash.desc: Shockwave Flash 32.0 r0 plugin.flash.lastmod_hi: 374 plugin.flash.lastmod_lo: 1137085296 plugin.flash.path: /usr/lib/mozilla/plugins/libflashplayer.so plugin.flash.version: 32.0.0.465 plugin.importedState: true privacy.bounceTrackingProtection.hasMigratedUserActivationData: true privacy.purge_trackers.date_in_cookie_database: 0 privacy.purge_trackers.last_purge: 1760969776008 privacy.trackingprotection.allow_list.hasMigratedCategoryPrefs: true security.disable_button.openCertManager: false security.disable_button.openDeviceManager: false security.OCSP.enabled: 0 security.remote_settings.crlite_filters.checked: 1631131225 security.remote_settings.intermediates.checked: 1631131225 security.sandbox.plugin.tempDirSuffix: 94d98491-6bca-418d-912e-98258b74dbd9 security.ssl.enable_ocsp_must_staple: false security.ssl.enable_ocsp_stapling: false security.tls.insecure_fallback_hosts: my.server.local signon.importedFromSqlite: true storage.vacuum.last.content-prefs.sqlite: 1758315070 storage.vacuum.last.index: 1 storage.vacuum.last.places.sqlite: 1758660683 svg.context-properties.content.enabled: true
user.js Preferences
Your profile folder contains a user.js file, which includes preferences that were not created by Thunderbird.
Important Locked Preferences
fission.autostart.session: true media.utility-process.enabled: true
Places Database
Accessibility
Activated: false Prevent Accessibility: 0
Library Versions
Expected minimum version
Version in use
NSPR
4.37
4.37
NSS
3.117
3.117
NSSSMIME
3.117
3.117
NSSSSL
3.117
3.117
NSSUTIL
3.117
3.117
Sandbox
Seccomp-BPF (System Call Filtering): true Seccomp Thread Synchronization: true User Namespaces: true Content Process Sandboxing: true Media Plugin Sandboxing: true Content Process Sandbox Level: 5 Effective Content Process Sandbox Level: 5
Rejected System Calls
#
Seconds Ago
PID
TID
Process Type
Syscall
Arguments
Startup Cache
Disk Cache Path: /home/XYZ/.cache/thunderbird/profile.XYZ/startupCache/startupCache.8.little Ignore Disk Cache: false Found Disk Cache on Init: false Wrote to Disk Cache: true
Internationalization & Localization
Application Settings
Requested Locales: ["en-US"]
Available Locales: ["en-US"]
App Locales: ["en-US"]
Regional Preferences: ["en-US"]
Default Locale: "en-US"
Operating System
System Locales: ["en-US"]
Regional Preferences: ["en-US"]
Remote Debugging (Chromium Protocol)
Accepting Connections: URL:
Printing
Modified print settings
print_printer: Mozilla Save to PDF print.print_bgcolor: false print.print_bgimages: false print.print_duplex: 0 print.print_evenpages: true print.print_margin_bottom: 0.5 print.print_margin_left: 0.5 print.print_margin_right: 0.5 print.print_margin_top: 0.5 print.print_oddpages: true print.print_orientation: 0 print.print_page_delay: 50 print.print_paper_data: 0 print.print_paper_height: 11.00 print.print_paper_name: na_letter print.print_paper_size_unit: 0 print.print_paper_width: 8.50 print.print_printer: KonicaC203 PCL print.print_scaling: 1.00 print.print_shrink_to_fit: true print.print_to_file: false print.print_unwriteable_margin_bottom: 56 print.print_unwriteable_margin_left: 25 print.print_unwriteable_margin_right: 25 print.print_unwriteable_margin_top: 25 print.printer_HL-L2380DW.print_bgcolor: false print.printer_HL-L2380DW.print_bgimages: false print.printer_HL-L2380DW.print_duplex: 0 print.printer_HL-L2380DW.print_edge_bottom: 0 print.printer_HL-L2380DW.print_edge_left: 0 print.printer_HL-L2380DW.print_edge_right: 0 print.printer_HL-L2380DW.print_edge_top: 0 print.printer_HL-L2380DW.print_footercenter: print.printer_HL-L2380DW.print_footerleft: &PT print.printer_HL-L2380DW.print_footerright: &D print.printer_HL-L2380DW.print_headercenter: &T print.printer_HL-L2380DW.print_headerleft: print.printer_HL-L2380DW.print_headerright: print.printer_HL-L2380DW.print_in_color: false print.printer_HL-L2380DW.print_margin_bottom: 0.5 print.printer_HL-L2380DW.print_margin_left: 0.5 print.printer_HL-L2380DW.print_margin_right: 0.5 print.printer_HL-L2380DW.print_margin_top: 0.5 print.printer_HL-L2380DW.print_orientation: 0 print.printer_HL-L2380DW.print_page_delay: 50 print.printer_HL-L2380DW.print_paper_height: 11 print.printer_HL-L2380DW.print_paper_id: na_letter_8.5x11in print.printer_HL-L2380DW.print_paper_size_unit: 0 print.printer_HL-L2380DW.print_paper_width: 8.5 print.printer_HL-L2380DW.print_resolution: 0 print.printer_HL-L2380DW.print_reversed: false print.printer_HL-L2380DW.print_scaling: 1 print.printer_HL-L2380DW.print_shrink_to_fit: true print.printer_HL-L2380DW.print_to_file: false print.printer_HL-L2380DW.print_unwriteable_margin_bottom: 17 print.printer_HL-L2380DW.print_unwriteable_margin_left: 17 print.printer_HL-L2380DW.print_unwriteable_margin_right: 17 print.printer_HL-L2380DW.print_unwriteable_margin_top: 17 print.printer_HOUSE-REMOTE-Dell_Laser_Printer_1110.print_bgcolor: false print.printer_HOUSE-REMOTE-Dell_Laser_Printer_1110.print_bgimages: false print.printer_HOUSE-REMOTE-Dell_Laser_Printer_1110.print_command: print.printer_HOUSE-REMOTE-Dell_Laser_Printer_1110.print_downloadfonts: true print.printer_HOUSE-REMOTE-Dell_Laser_Printer_1110.print_evenpages: true print.printer_HOUSE-REMOTE-Dell_Laser_Printer_1110.print_footercenter: print.printer_HOUSE-REMOTE-Dell_Laser_Printer_1110.print_footerleft: &PT print.printer_HOUSE-REMOTE-Dell_Laser_Printer_1110.print_footerright: &D 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Up through Thunderbird 142 everything was working great. Starting with 143, I get frequent "client didn't present a certificate" errors, but the next attempt will work (or not). I didn't report it, hoping that 144 would fix it. It didn't, and I've also updated to 144.0.1, still no joy.
I am running Thunderbird on Arch Linux. I am connecting to a postfix/dovecot back end that I control on Ubuntu 24.04. I have made numerous tweaks to various SSL/TLS settings on each side (some of which seemed to lessen the frequency, but not resolve the issue), so I reverted nearly all of the changes.
The issue occurs whether I am in Thunderbird trouble-shooting mode (safe mode) or not. I also cleared the startup cache which made no difference. I am including server output from when I was in trouble-shooting mode, as well as a dump from trouble-shooting mode from Thunderbird.
According to AI (I know, shoot me...), the issue occurs because Thunderbird is insisting on cached TLS connections in TLSv1.3 no matter what settings I have, and dovecot isn't handling it well. I have tried forcing TLSv1.2 only, which is one of the things that made the problem less frequent, but it still didn't go away completely.
I apologize for the formatting in advance, but I don't see any way to upload a file (other than an image?) or create a code block. I'll happily fix this if someone lets me know the correct way to handle this...
Here is the output from dovecot on the server:
Oct 20 10:12:23 imap-login: Info: Login: user=<XXX>, method=PLAIN, rip=192.168.100.2, lip=192.168.100.1, mpid=945421, TLS, session=<Q4IQrJdBsOrAqGQC>
Oct 20 10:12:33 imap-login: Info: Login: user=<XXX>, method=PLAIN, rip=192.168.100.2, lip=192.168.100.1, mpid=945436, TLS, session=<i8K1rJdBIsXAqGQC>
Oct 20 10:12:35 imap-login: Info: Login: user=<YYY>, method=PLAIN, rip=192.168.100.2, lip=192.168.100.1, mpid=945438, TLS, session=<Oc7VrJdBQovAqGQC>
Oct 20 10:14:35 pop3-login: Info: Login: user=<ZZZ>, method=PLAIN, rip=192.168.100.2, lip=192.168.100.1, mpid=945590, TLS, session=<Olzvs5dBcpPAqGQC>
Oct 20 10:17:28 pop3-login: Info: Login: user=<ZZZ>, method=PLAIN, rip=192.168.100.2, lip=192.168.100.1, mpid=945770, TLS, session=<0vxBvpdBCNzAqGQC>
Oct 20 10:21:20 pop3-login: Info: Login: user=<ZZZ>, method=PLAIN, rip=192.168.100.2, lip=192.168.100.1, mpid=946000, TLS, session=<dAsezJdBVMXAqGQC>
Oct 20 10:25:01 pop3-login: Info: Disconnected: Connection closed (client didn't send a cert): user=<>, rip=192.168.100.2, lip=192.168.100.1, TLS handshaking: Connection closed, session=<bJVJ2ZdBppPAqGQC>
Oct 20 10:28:08 pop3-login: Info: Disconnected: Connection closed (client didn't send a cert): user=<>, rip=192.168.100.2, lip=192.168.100.1, TLS handshaking: Connection closed, session=<K/dw5JdBqpzAqGQC>
Oct 20 10:31:11 pop3-login: Info: Disconnected: Connection closed (client didn't send a cert): user=<>, rip=192.168.100.2, lip=192.168.100.1, TLS handshaking: Connection closed, session=<Z0lZ75dB8rPAqGQC>
Oct 20 10:34:06 pop3-login: Info: Disconnected: Connection closed (client didn't send a cert): user=<>, rip=192.168.100.2, lip=192.168.100.1, TLS handshaking: Connection closed, session=<uZC8+ZdBvpXAqGQC>
And here the much longer output from the trouble-shooting dump. I have sanitized the user names and server names, but nothing else was touched:
Application Basics
Name: Thunderbird
Version: 144.0.1
Build ID: 20251017171753
Distribution ID: archlinux
User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:144.0) Gecko/20100101 Thunderbird/144.0.1
OS: Linux 6.17.3-arch2-1 #1 SMP PREEMPT_DYNAMIC Fri, 17 Oct 2025 13:29:06 +0000
OS Theme: Adwaita / Adwaita
Multiprocess Windows: 0/0
Fission Windows: 0/0
Enabled by default
Remote Processes: 2
Enterprise Policies: Inactive
Google Location Service Key: Found
Google Safebrowsing Key: Found
Mozilla Location Service Key: Found
Safe Mode: true
Memory Size (RAM): 60.6 GB
Disk Space Available: 883 GB
Mail and News Accounts
account1:
INCOMING: account1, , (none) Local Folders, plain, passwordCleartext
account2:
INCOMING: account2, , (nntp) news.gmane.org:119, plain, passwordCleartext
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, true
account3:
INCOMING: account3, , (rss) Feeds, plain, passwordCleartext
account4:
INCOMING: account4, , (pop3) 192.168.100.1:995, SSL, passwordCleartext
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, true
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, false
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, false
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, false
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, false
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, false
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, false
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, false
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, false
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, false
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, false
account6:
INCOMING: account6, , (imap) imap.googlemail.com:993, SSL, passwordCleartext
OUTGOING: , smtp.googlemail.com:465, SSL, passwordCleartext, true
account7:
INCOMING: account7, , (pop3) test.com:110, alwaysSTARTTLS, passwordCleartext
OUTGOING: , smtp.gmail.com:587, alwaysSTARTTLS, passwordCleartext, true
account12:
INCOMING: account12, , (imap) 192.168.100.1:993, SSL, passwordCleartext
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, true
account16:
INCOMING: account16, , (imap) 192.168.100.1:993, SSL, passwordCleartext
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, true
account17:
INCOMING: account17, , (imap) 192.168.100.1:993, SSL, passwordCleartext
OUTGOING: , my.server.local:587, alwaysSTARTTLS, passwordCleartext, true
Libraries
Library
Status
Expected minimum version
Version in use
Path
RNP (OpenPGP)
OK
0.17.1
0.17.1.MZLA.144.0.1.botan
/usr/lib/thunderbird/librnp.so
OTR
Failed to load. OTR chat encryption will not work.
-
-
-
Calendar Settings
XYZ
Name
Value
Name:
Type: gdata
Disabled: true
Username:
URI:
Refresh Interval: 30
Read-only: false
Suppress Alarms: false
Cache Enabled: false
iMIP Identity:
iMIP Disabled:
iMIP Account:
Organizer Id:
Force Email Scheduling:
Popup Alarms Supported:
Alarms on Invitation Supported:
Max Alarms Per Event:
Attachment Supported:
Max Categories:
Privacy State Supported:
Priority Supported:
Event Supported:
Task Supported:
Local Time Supported:
UTC/GMT Supported:
Auto-Scheduling Supported:
Remote Processes
Type: Count
RDD: 1
Isolated Web Content: 1
Add-ons
Name
Type
Version
Enabled
Location
ID
Amazon.com
extension
1.1
true
app-builtin
amazondotcom@search.mozilla.org
Bing
extension
1.0
true
app-builtin
bing@search.mozilla.org
DuckDuckGo
extension
1.0
true
app-builtin
ddg@search.mozilla.org
Google
extension
1.0
true
app-builtin
google@search.mozilla.org
Wikipedia (en)
extension
1.0
true
app-builtin
wikipedia@search.mozilla.org
Dark
theme
1.3.1
true
app-builtin
thunderbird-compact-dark@mozilla.org
United States English Spellchecker
dictionary
8.1
false
app-profile
en-US@dictionaries.addons.mozilla.org
CardBook
extension
101.3
false
app-profile
cardbook@vigneau.philippe
Dark Reader
extension
4.9.68
false
app-profile
addon@darkreader.org
Darko
extension
3.9
false
app-profile
admin@fastaddons.com_Darko
ImportExportTools NG
extension
14.1.14
false
app-profile
ImportExportToolsNG@cleidigh.kokkini.net
Markdown Here Revival
extension
4.0.7
false
app-profile
markdown-here-revival@xul.calypsoblue.org
Monterail Full Dark
extension
3.3
false
app-profile
MonterailFullDark2@conema.me
Provider for Google Calendar
extension
128.5.7
false
app-profile
{a62ef8ec-5fdc-40c2-873c-223b8a6925cc}
Todoist for Thunderbird: To-Do list and Task Manager
extension
4.3
false
app-profile
{88f55c90-a688-11e1-b3dd-0800200c9a66}
Light
theme
1.3.1
false
app-builtin
thunderbird-compact-light@mozilla.org
System theme — auto
theme
1.4.2
false
app-builtin
default-theme@mozilla.org
Security Software
Type: Name
Antivirus:
Antispyware:
Firewall:
Legacy User Stylesheets
Active: true
Stylesheets: userContent.css
Graphics
Features
Compositing: WebRender (Software)
Font Visibility Debug Info: Linux Unknown - ID=arch
Asynchronous Pan/Zoom: wheel input enabled; scrollbar drag enabled; keyboard enabled; autoscroll enabled; smooth pinch-zoom enabled
WebGL 1 Driver WSI Info: -
WebGL 1 Driver Renderer: WebGL is currently disabled.
WebGL 1 Driver Version: -
WebGL 1 Driver Extensions: -
WebGL 1 Extensions: -
WebGL 2 Driver WSI Info: -
WebGL 2 Driver Renderer: WebGL is currently disabled.
WebGL 2 Driver Version: -
WebGL 2 Driver Extensions: -
WebGL 2 Extensions: -
Window Protocol: wayland
Desktop Environment: sway
Target Frame Rate: 60
GPU #1
Active: Yes
Description: AMD Radeon 780M Graphics (radeonsi, phoenix, LLVM 20.1.8, DRM 3.64, 6.17.3-arch2-1)
Vendor ID: 0x1002
Device ID: 0x15bf
Driver Vendor: mesa/radeonsi
Driver Version: 25.2.4.0
RAM: 0
GPU #2
Diagnostics
AzureCanvasBackend: skia
AzureContentBackend: skia
AzureFallbackCanvasBackend: skia
CMSOutputProfile: Empty profile data
Display0: 3840x2160@60Hz scales:1.000000|1.000000
DisplayCount: 1
Window Device Pixel Ratios: 1
Font Visibility Debug Info: Linux Unknown - ID=arch
WebGPU Default Adapter: [object Object]
WebGPU Fallback Adapter: [object Object]
Decision Log
HW_COMPOSITING: available by defaultblocked by runtime: Acceleration blocked by safe-mode
OPENGL_COMPOSITING: unavailable by default: Hardware compositing is disabled
WEBRENDER: available by defaultunavailable-in-safe-mode by runtime: Safe-mode is enabled
WEBRENDER_COMPOSITOR: disabled by default: Disabled by defaultblocklisted by env: Blocklisted by gfxInfo
WEBRENDER_PARTIAL: available by default
WEBRENDER_SHADER_CACHE: disabled by default: Disabled by defaultunavailable by runtime: WebRender disabled
WEBRENDER_OPTIMIZED_SHADERS: available by defaultunavailable by runtime: WebRender disabled
WEBRENDER_ANGLE: available by defaultunavailable by env: OS not supported
WEBRENDER_DCOMP_PRESENT: available by defaultdisabled by user: User disabled via prefunavailable by env: Requires GPU processunavailable by runtime: Requires ANGLE
WEBRENDER_SCISSORED_CACHE_CLEARS: available by default
WEBGPU: available by default
X11_EGL: available by default
DMABUF: available by default
HARDWARE_VIDEO_DECODING: available by default
HARDWARE_VIDEO_ENCODING: available by default
HW_DECODED_VIDEO_ZERO_COPY: available by default
VP8_HW_DECODE: available by defaultBlocklisted; failure code BLOCKLIST_FEATURE_FAILURE_VIDEO_DECODING_MISSING
VP9_HW_DECODE: available by default
DMABUF_SURFACE_EXPORT: available by defaultblocked by env: Blocklisted by gfxInfo
BACKDROP_FILTER: available by default
CANVAS_RENDERER_THREAD: available by default
ACCELERATED_CANVAS2D: available by defaultblocked by env: Disabled by Software WebRender
H264_HW_DECODE: available by default
AV1_HW_DECODE: available by default
HEVC_HW_DECODE: available by default
REMOTE_CANVAS: disabled by default: Disabled via prefunavailable-no-gpu-process by env: Disabled without GPU processblocked by runtime: Platform not supported
DMABUF_WEBGL: available by default
VP8_HW_ENCODE: available by defaultBlocklisted; failure code BLOCKLIST_FEATURE_FAILURE_VIDEO_ENCODING_MISSING
VP9_HW_ENCODE: available by defaultBlocklisted; failure code BLOCKLIST_FEATURE_FAILURE_VIDEO_ENCODING_MISSING
H264_HW_ENCODE: available by default
AV1_HW_ENCODE: available by default
HEVC_HW_ENCODE: available by default
GL_NORM16_TEXTURES: available by default
WEBGPU_EXTERNAL_TEXTURE: disabled by default: Disabled by defaultblocked by runtime: WebGPU external textures are not supported on this Operating Sy
Crash Guard Disabled Features
Workarounds
Failure Log
(#0) Error: RenderCompositorSWGL failed mapping default framebuffer, no dt
Media
Audio Backend: pulse-rust
Max Channels: 2
Preferred Sample Rate: 48000
Roundtrip latency (standard deviation): 96.96ms (20.22)
Output Devices
Name
Group
Vendor
State
Preferred
Format
Channels
Rate
Latency
Radeon High Definition Audio Controller [Rembrandt/Strix] Digital Stereo (HDMI)
/devices/pci0000:00/0000:00:08.1/0000:c5:00.1/sound/card0
Advanced Micro Devices, Inc. [AMD/ATI]
Enabled
None
default: F32LE, support: S16LE S16BE F32LE F32BE
2
default: 48000, support: 1 - 384000
0 - 0
KM_B2 Digital Audio Analog Stereo
/devices/pci0000:00/0000:00:08.3/0000:c7:00.4/usb7/7-1/7-1.2/7-1.2:1.0/sound/card2
Intel Corp.
Enabled
All
default: S16LE, support: S16LE S16BE F32LE F32BE
2
default: 48000, support: 1 - 384000
0 - 0
Input Devices
Name
Group
Vendor
State
Preferred
Format
Channels
Rate
Latency
Monitor of Radeon High Definition Audio Controller [Rembrandt/Strix] Digital Stereo (HDMI)
/devices/pci0000:00/0000:00:08.1/0000:c5:00.1/sound/card0
Advanced Micro Devices, Inc. [AMD/ATI]
Enabled
None
default: F32LE, support: S16LE S16BE F32LE F32BE
2
default: 48000, support: 1 - 384000
0 - 0
1080P USB Camera Pro
/devices/pci0000:00/0000:00:08.1/0000:c5:00.3/usb1/1-1/1-1.1/1-1.1:1.2/sound/card3
SN0002
Enabled
None
default: S16LE, support: S16LE S16BE F32LE F32BE
1
default: 16000, support: 1 - 384000
0 - 0
Family 17h/19h/1ah HD Audio Controller Analog Stereo
/devices/pci0000:00/0000:00:08.1/0000:c5:00.6/sound/card1
Advanced Micro Devices, Inc. [AMD]
Enabled
All
default: F32LE, support: S16LE S16BE F32LE F32BE
2
default: 48000, support: 1 - 384000
0 - 0
Monitor of KM_B2 Digital Audio Analog Stereo
/devices/pci0000:00/0000:00:08.3/0000:c7:00.4/usb7/7-1/7-1.2/7-1.2:1.0/sound/card2
Intel Corp.
Enabled
None
default: S16LE, support: S16LE S16BE F32LE F32BE
2
default: 48000, support: 1 - 384000
0 - 0
KM_B2 Digital Audio Mono
/devices/pci0000:00/0000:00:08.3/0000:c7:00.4/usb7/7-1/7-1.2/7-1.2:1.0/sound/card2
Intel Corp.
Enabled
None
default: S16LE, support: S16LE S16BE F32LE F32BE
1
default: 48000, support: 1 - 384000
0 - 0
Media Capabilities
Enumerate database
Environment Variables
DISPLAY: :0
GDK_BACKEND: wayland
MOZ_ASSUME_USER_NS: 1
MOZ_LAUNCHED_CHILD:
MOZ_APP_SILENT_START:
XRE_PROFILE_PATH:
XRE_PROFILE_LOCAL_PATH:
XRE_START_OFFLINE:
XRE_BINARY_PATH:
XRE_RESTARTED_BY_PROFILE_MANAGER:
MOZ_SAFE_MODE_RESTART:
MOZ_APP_RESTART: 1
Important Modified Preferences
accessibility.typeaheadfind.flashBar: 0
browser.cache.disk.amount_written: 509526
browser.cache.disk.capacity: 1048576
browser.cache.disk.filesystem_reported: 1
browser.cache.disk.hashstats_reported: 1
browser.cache.disk.smart_size_cached_value: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.cache.disk.telemetry_report_ID: 3
browser.display.screen_resolution: 96
browser.display.use_document_fonts: 0
browser.search.region: US
extensions.lastAppVersion: 144.0.1
font.internaluseonly.changed: false
font.language.group: x-western
font.name.monospace.el: Consolas
font.name.monospace.tr: Consolas
font.name.monospace.x-baltic: Consolas
font.name.monospace.x-central-euro: Consolas
font.name.monospace.x-cyrillic: Consolas
font.name.monospace.x-unicode: Consolas
font.name.monospace.x-western: Consolas
font.name.sans-serif.el: Calibri
font.name.sans-serif.tr: Calibri
font.name.sans-serif.x-baltic: Calibri
font.name.sans-serif.x-central-euro: Calibri
font.name.sans-serif.x-cyrillic: Calibri
font.name.sans-serif.x-unicode: Calibri
font.name.sans-serif.x-western: DejaVu Sans Mono
font.name.serif.el: Cambria
font.name.serif.tr: Cambria
font.name.serif.x-baltic: Cambria
font.name.serif.x-central-euro: Cambria
font.name.serif.x-cyrillic: Cambria
font.name.serif.x-unicode: Cambria
font.name.serif.x-western: Cambria
font.size.fixed.el: 14
font.size.fixed.tr: 14
font.size.fixed.x-baltic: 14
font.size.fixed.x-central-euro: 14
font.size.fixed.x-cyrillic: 14
font.size.fixed.x-unicode: 14
font.size.fixed.x-western: 14
font.size.monospace.x-unicode: 20
font.size.monospace.x-western: 20
font.size.variable.el: 17
font.size.variable.tr: 17
font.size.variable.x-baltic: 17
font.size.variable.x-central-euro: 17
font.size.variable.x-cyrillic: 17
font.size.variable.x-unicode: 20
font.size.variable.x-western: 20
idle.lastDailyNotification: 1760969776
media.gmp.storage.version.observed: 1
network.cookie.CHIPS.lastMigrateDatabase: 2
network.cookie.cookieBehavior: 1
network.cookie.prefsMigrated: true
network.predictor.cleaned-up: true
network.ssl_tokens_cache_records_per_entry: 10
network.trr.blocklist_cleanup_done: true
places.database.lastMaintenance: 1760969776
places.history.expiration.transient_current_max_pages: 115823
plugin.flash.arch: x86_64-gcc3
plugin.flash.blockliststate: 0
plugin.flash.desc: Shockwave Flash 32.0 r0
plugin.flash.lastmod_hi: 374
plugin.flash.lastmod_lo: 1137085296
plugin.flash.path: /usr/lib/mozilla/plugins/libflashplayer.so
plugin.flash.version: 32.0.0.465
plugin.importedState: true
privacy.bounceTrackingProtection.hasMigratedUserActivationData: true
privacy.purge_trackers.date_in_cookie_database: 0
privacy.purge_trackers.last_purge: 1760969776008
privacy.trackingprotection.allow_list.hasMigratedCategoryPrefs: true
security.disable_button.openCertManager: false
security.disable_button.openDeviceManager: false
security.OCSP.enabled: 0
security.remote_settings.crlite_filters.checked: 1631131225
security.remote_settings.intermediates.checked: 1631131225
security.sandbox.plugin.tempDirSuffix: 94d98491-6bca-418d-912e-98258b74dbd9
security.ssl.enable_ocsp_must_staple: false
security.ssl.enable_ocsp_stapling: false
security.tls.insecure_fallback_hosts: my.server.local
signon.importedFromSqlite: true
storage.vacuum.last.content-prefs.sqlite: 1758315070
storage.vacuum.last.index: 1
storage.vacuum.last.places.sqlite: 1758660683
svg.context-properties.content.enabled: true
user.js Preferences
Your profile folder contains a
user.js file, which includes preferences that were not created by Thunderbird.
Important Locked Preferences
fission.autostart.session: true
media.utility-process.enabled: true
Places Database
Accessibility
Activated: false
Prevent Accessibility: 0
Library Versions
Expected minimum version
Version in use
NSPR
4.37
4.37
NSS
3.117
3.117
NSSSMIME
3.117
3.117
NSSSSL
3.117
3.117
NSSUTIL
3.117
3.117
Sandbox
Seccomp-BPF (System Call Filtering): true
Seccomp Thread Synchronization: true
User Namespaces: true
Content Process Sandboxing: true
Media Plugin Sandboxing: true
Content Process Sandbox Level: 5
Effective Content Process Sandbox Level: 5
Rejected System Calls
#
Seconds Ago
PID
TID
Process Type
Syscall
Arguments
Startup Cache
Disk Cache Path: /home/XYZ/.cache/thunderbird/profile.XYZ/startupCache/startupCache.8.little
Ignore Disk Cache: false
Found Disk Cache on Init: false
Wrote to Disk Cache: true
Internationalization & Localization
Application Settings
Requested Locales: ["en-US"]
Available Locales: ["en-US"]
App Locales: ["en-US"]
Regional Preferences: ["en-US"]
Default Locale: "en-US"
Operating System
System Locales: ["en-US"]
Regional Preferences: ["en-US"]
Remote Debugging (Chromium Protocol)
Accepting Connections:
URL:
Printing
Modified print settings
print_printer: Mozilla Save to PDF
print.print_bgcolor: false
print.print_bgimages: false
print.print_duplex: 0
print.print_evenpages: true
print.print_margin_bottom: 0.5
print.print_margin_left: 0.5
print.print_margin_right: 0.5
print.print_margin_top: 0.5
print.print_oddpages: true
print.print_orientation: 0
print.print_page_delay: 50
print.print_paper_data: 0
print.print_paper_height: 11.00
print.print_paper_name: na_letter
print.print_paper_size_unit: 0
print.print_paper_width: 8.50
print.print_printer: KonicaC203 PCL
print.print_scaling: 1.00
print.print_shrink_to_fit: true
print.print_to_file: false
print.print_unwriteable_margin_bottom: 56
print.print_unwriteable_margin_left: 25
print.print_unwriteable_margin_right: 25
print.print_unwriteable_margin_top: 25
print.printer_HL-L2380DW.print_bgcolor: false
print.printer_HL-L2380DW.print_bgimages: false
print.printer_HL-L2380DW.print_duplex: 0
print.printer_HL-L2380DW.print_edge_bottom: 0
print.printer_HL-L2380DW.print_edge_left: 0
print.printer_HL-L2380DW.print_edge_right: 0
print.printer_HL-L2380DW.print_edge_top: 0
print.printer_HL-L2380DW.print_footercenter:
print.printer_HL-L2380DW.print_footerleft: &PT
print.printer_HL-L2380DW.print_footerright: &D
print.printer_HL-L2380DW.print_headercenter: &T
print.printer_HL-L2380DW.print_headerleft:
print.printer_HL-L2380DW.print_headerright:
print.printer_HL-L2380DW.print_in_color: false
print.printer_HL-L2380DW.print_margin_bottom: 0.5
print.printer_HL-L2380DW.print_margin_left: 0.5
print.printer_HL-L2380DW.print_margin_right: 0.5
print.printer_HL-L2380DW.print_margin_top: 0.5
print.printer_HL-L2380DW.print_orientation: 0
print.printer_HL-L2380DW.print_page_delay: 50
print.printer_HL-L2380DW.print_paper_height: 11
print.printer_HL-L2380DW.print_paper_id: na_letter_8.5x11in
print.printer_HL-L2380DW.print_paper_size_unit: 0
print.printer_HL-L2380DW.print_paper_width: 8.5
print.printer_HL-L2380DW.print_resolution: 0
print.printer_HL-L2380DW.print_reversed: false
print.printer_HL-L2380DW.print_scaling: 1
print.printer_HL-L2380DW.print_shrink_to_fit: true
print.printer_HL-L2380DW.print_to_file: false
print.printer_HL-L2380DW.print_unwriteable_margin_bottom: 17
print.printer_HL-L2380DW.print_unwriteable_margin_left: 17
print.printer_HL-L2380DW.print_unwriteable_margin_right: 17
print.printer_HL-L2380DW.print_unwriteable_margin_top: 17
print.printer_HOUSE-REMOTE-Dell_Laser_Printer_1110.print_bgcolor: false
print.printer_HOUSE-REMOTE-Dell_Laser_Printer_1110.print_bgimages: false
print.printer_HOUSE-REMOTE-Dell_Laser_Printer_1110.print_command:
print.printer_HOUSE-REMOTE-Dell_Laser_Printer_1110.print_downloadfonts: true
print.printer_HOUSE-REMOTE-Dell_Laser_Printer_1110.print_evenpages: true
print.printer_HOUSE-REMOTE-Dell_Laser_Printer_1110.print_footercenter:
print.printer_HOUSE-REMOTE-Dell_Laser_Printer_1110.print_footerleft: &PT
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print.printer_HOUSE-REMOTE-Dell_Laser_Printer_1110.print_margin_left: 0.5
print.printer_HOUSE-REMOTE-Dell_Laser_Printer_1110.print_margin_right: 0.5
print.printer_HOUSE-REMOTE-Dell_Laser_Printer_1110.print_margin_top: 0.5
print.printer_HOUSE-REMOTE-Dell_Laser_Printer_1110.print_oddpages: true
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print.printer_HOUSE-REMOTE-Dell_Laser_Printer_1110.print_scaling: 1.00
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print.printer_HOUSE-REMOTE-Dell_Laser_Printer_1110.print_to_file: false
print.printer_KonicaC203_PCL.print_bgcolor: false
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print.printer_Samsung_SCX-4100_Series_(Copy_1).print_paper_size_unit: 1
print.printer_Samsung_SCX-4100_Series_(Copy_1).print_paper_width: 8.50
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print.printer_Samsung_SCX-4100_Series_(Copy_1).print_reversed: false
print.printer_Samsung_SCX-4100_Series_(Copy_1).print_scaling: 1.00
print.printer_Samsung_SCX-4100_Series_(Copy_1).print_shrink_to_fit: true
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print.printer_Samsung_SCX-4100_Series.print_bgimages: false
print.printer_Samsung_SCX-4100_Series.print_command:
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print.printer_Samsung_SCX-4100_Series.print_pagedelay: 500
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print.printer_Samsung_SCX-4100_Series.print_unwriteable_margin_right: 0
print.printer_Samsung_SCX-4100_Series.print_unwriteable_margin_top: 0
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print.tmp.printerfeatures.Samsung-SCX-4100-Series.can_change_downloadfonts: false
print.tmp.printerfeatures.Samsung-SCX-4100-Series.can_change_jobtitle: false
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print.tmp.printerfeatures.Samsung-SCX-4100-Series.can_change_orientation: true
print.tmp.printerfeatures.Samsung-SCX-4100-Series.can_change_paper_size: true
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print.tmp.printerfeatures.Samsung-SCX-4100-Series.can_change_printincolor: true
print.tmp.printerfeatures.Samsung-SCX-4100-Series.can_change_resolution: false
print.tmp.printerfeatures.Samsung-SCX-4100-Series.can_change_spoolercommand: false
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print.tmp.printerfeatures.Samsung-SCX-4100-Series.paper.6.height_mm: 254
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print.tmp.printerfeatures.Samsung-SCX-4100-Series.supports_colorspace_change: false
print.tmp.printerfeatures.Samsung-SCX-4100-Series.supports_downloadfonts_change: false
print.tmp.printerfeatures.Samsung-SCX-4100-Series.supports_jobtitle_change: false
print.tmp.printerfeatures.Samsung-SCX-4100-Series.supports_orientation_change: true
print.tmp.printerfeatures.Samsung-SCX-4100-Series.supports_paper_size_change: true
print.tmp.printerfeatures.Samsung-SCX-4100-Series.supports_plex_change: false
print.tmp.printerfeatures.Samsung-SCX-4100-Series.supports_printincolor_change: true
print.tmp.printerfeatures.Samsung-SCX-4100-Series.supports_resolution_change: false
print.tmp.printerfeatures.Samsung-SCX-4100-Series.supports_spoolercommand_change: false
print.tmp.printerfeatures.SCX-4100-Series.can_change_colorspace: false
print.tmp.printerfeatures.SCX-4100-Series.can_change_downloadfonts: false
print.tmp.printerfeatures.SCX-4100-Series.can_change_jobtitle: false
print.tmp.printerfeatures.SCX-4100-Series.can_change_num_copies: true
print.tmp.printerfeatures.SCX-4100-Series.can_change_orientation: true
print.tmp.printerfeatures.SCX-4100-Series.can_change_paper_size: true
print.tmp.printerfeatures.SCX-4100-Series.can_change_plex: false
print.tmp.printerfeatures.SCX-4100-Series.can_change_printincolor: true
print.tmp.printerfeatures.SCX-4100-Series.can_change_resolution: false
print.tmp.printerfeatures.SCX-4100-Series.can_change_spoolercommand: false
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print.tmp.printerfeatures.SCX-4100-Series.has_special_printerfeatures: true
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print.tmp.printerfeatures.SCX-4100-Series.orientation.count: 2
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print.tmp.printerfeatures.SCX-4100-Series.paper.4.is_inch: true
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print.tmp.printerfeatures.SCX-4100-Series.paper.4.width_mm: 215
print.tmp.printerfeatures.SCX-4100-Series.paper.5.height_mm: 431
print.tmp.printerfeatures.SCX-4100-Series.paper.5.is_inch: true
print.tmp.printerfeatures.SCX-4100-Series.paper.5.name: Tabloid
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print.tmp.printerfeatures.SCX-4100-Series.paper.6.is_inch: true
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print.tmp.printerfeatures.SCX-4100-Series.paper.count: 7
print.tmp.printerfeatures.SCX-4100-Series.plex.0.name: default
print.tmp.printerfeatures.SCX-4100-Series.plex.count: 1
print.tmp.printerfeatures.SCX-4100-Series.resolution.0.name: default
print.tmp.printerfeatures.SCX-4100-Series.resolution.count: 1
print.tmp.printerfeatures.SCX-4100-Series.supports_colorspace_change: false
print.tmp.printerfeatures.SCX-4100-Series.supports_downloadfonts_change: false
print.tmp.printerfeatures.SCX-4100-Series.supports_jobtitle_change: false
print.tmp.printerfeatures.SCX-4100-Series.supports_orientation_change: true
print.tmp.printerfeatures.SCX-4100-Series.supports_paper_size_change: true
print.tmp.printerfeatures.SCX-4100-Series.supports_plex_change: false
print.tmp.printerfeatures.SCX-4100-Series.supports_printincolor_change: true
print.tmp.printerfeatures.SCX-4100-Series.supports_resolution_change: false
print.tmp.printerfeatures.SCX-4100-Series.supports_spoolercommand_change: false
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