User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:96.0) Gecko/20100101 Firefox/96.0

Steps to reproduce:

For the last few days (about 3, I guess), Firefox Nightly has started doing this odd thing:

The page will appear to freeze (it won't update whilst I'm typing or clicking button will appear to do nothing). Switching away from the tab and back again, the page updates. This normally happens when I've just switched to a tab - but I've had a few times on GitHub, filling in commentary on a PR, when this has happened in the middle of typing the commentary.

Actual results:

Page appears to freeze, sometimes the whole page goes blank, but moving the mouse updates the cursor as I move over clickables. Anything I type doesn't seem to be reflected until I switch away to another tab and then back again.

Expected results:

The page should update as necessary.

BTW, I've tried a brand-new profile, just logged in to FF sync and then disabled all the plugins that were synced down and the issue continues. I can't really work without some of these extensions tho ):

Hi Davyd!

Can you provide any steps to try to reproduce on my end?
Maybe mention all the pages you had open while you observed this issue? How many tabs/windows did you have at the time? This is specific to Github or you've experienced this in other websites too?
Could you attach your about:support information?
I've assigned a component in order to get the dev team involved.

Thanks!
Best regards,
Clara

Hi Clara

Steps to repro are difficult to define (sorry! I know this makes it much harder to fix a problem if it's not easily reproducable) - it was just happening all the time, then I made the new profile and I've stuck with it and it seemed to have stopped, but then started up again. I have been slowly re-enabling the extensions that I use. One of the extensions I kinda can't deal with out is Dark Reader, and I'm not sure if there's some odd interaction happening here, but only because sometimes tabs are entirely the kinda "default dark" color. However, I have had the issue even when Dark Reader was disabled (both through the extension and by disabling the extension), so I'm not sure if perhaps DR just exacerbates the problem?

Pages I've experienced this on include WhatsApp Web, Github, Twitter, Quip and a couple others, so I don't think it's endemic to a specific site, but the sites I've mentioned all have fairly "high-tech" interfaces - they aren't just plain-old pages like, eg, Hacker News.

Number of tabs open - typically I have about 10 pinned tabs and probably about another 2-10 open. I tend to clear up a lot by moving a tab I'm interested in as far left as possible and closing all tabs to the right. I'll do this whenever tab text starts getting a little iffy to read, so even getting to 10 extra tabs open is odd for me - typically the non-pinned tab count won't go past about 8.

On the day I reported this, it was practically blocking usage, but today I've only experienced it once or twice. Typically I can either refresh the page or sometimes it comes right after a bit of input (ie type blind and hope for the best).

about:support info is:
Application Basics

Name: Firefox
Version: 96.0a1
Build ID: 20211112092317
Distribution ID:
Update Channel: nightly
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:96.0) Gecko/20100101 Firefox/96.0
OS: Windows_NT 10.0 19043
Launcher Process: Enabled
Multiprocess Windows: 1/1
Fission Windows: 1/1 Enabled by experiment
Remote Processes: 21
Enterprise Policies: Inactive
Google Location Service Key: Found
Google Safebrowsing Key: Found
Mozilla Location Service Key: Found
Safe Mode: false

Crash Reports for the Last 3 Days

Nightly Features

Name: DoH Roll-Out
Version: 2.0.0
ID: doh-rollout@mozilla.org

Name: Firefox Screenshots
Version: 39.0.1
ID: screenshots@mozilla.org

Name: Form Autofill
Version: 1.0.1
ID: formautofill@mozilla.org

Name: Picture-In-Picture
Version: 1.0.0
ID: pictureinpicture@mozilla.org

Name: Proxy Failover
Version: 1.0.2
ID: proxy-failover@mozilla.com

Name: Web Compatibility Interventions
Version: 28.3.0
ID: webcompat@mozilla.org

Name: WebCompat Reporter
Version: 1.4.2
ID: webcompat-reporter@mozilla.org

Remote Features

bug-1705528-rollout-ongoing-fission-nightly-rollout-clone-nightly-90-100: active

Remote Processes

Type: Privileged About
Count: 1

Type: Extension
Count: 1

Type: Isolated Web Content
Count: 14

Type: Preallocated
Count: 3

Type: GPU
Count: 1

Type: Socket
Count: 1

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ID: addons-search-detection@mozilla.com

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Type: extension
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ID: amazondotcom@search.mozilla.org

Name: Bing
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ID: bing@search.mozilla.org

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Name: Dark Reader
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ID: addon@darkreader.org

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ID: disable-html5-autoplay@afnankhan

Name: DuckDuckGo
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Enabled: true
ID: ddg@search.mozilla.org

Name: DuckDuckGo Privacy Essentials
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ID: jid1-ZAdIEUB7XOzOJw@jetpack

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ID: fdm_ffext2@freedownloadmanager.org

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ID: google@search.mozilla.org

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ID: wikipedia@search.mozilla.org

Name: YouTube High Definition
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ID: {7b1bf0b6-a1b9-42b0-b75d-252036438bdc}

Name: YouTube NonStop
Type: extension
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ID: {0d7cafdd-501c-49ca-8ebb-e3341caaa55e}

Name: Cookie AutoDelete
Type: extension
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ID: CookieAutoDelete@kennydo.com

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Type: extension
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ID: {60f82f00-9ad5-4de5-b31c-b16a47c51558}

Name: DownThemAll!
Type: extension
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ID: {DDC359D1-844A-42a7-9AA1-88A850A938A8}

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ID: {b9acf540-acba-11e1-8ccb-001fd0e08bd4}

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Type: extension
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ID: {36bdf805-c6f2-4f41-94d2-9b646342c1dc}

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Type: extension
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ID: {5eddefd2-1d1e-4e7b-b9b5-1da06d23588b}

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Type: extension
Version: 3.3.4
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ID: jid1-KKzOGWgsW3Ao4Q@jetpack

Name: JetBrains Toolbox Extension
Type: extension
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ID: {bf9e77ee-c405-4dd7-9bed-2f55e448d19a}

Name: Netflix 1080p
Type: extension
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ID: {f18f0257-10ad-4ff7-b51e-6895edeccfc8}

Name: Open in Sidebar
Type: extension
Version: 2019.7.8
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ID: open-link-in-sidebar@afnankhan

Name: PixelZoomer
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ID: pixelzoomer@matthiasschuetz.com

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Name: QR Code (Generator and Reader)
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Type: extension
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ID: Shortkeys@Shortkeys.com

Name: Stylus
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Name: Tab Auto Refresh
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Name: Tab Reloader (page auto refresh)
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ID: jid0-bnmfwWw2w2w4e4edvcdDbnMhdVg@jetpack

Name: To Google Translate
Type: extension
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ID: {9bbf6724-d709-492e-a313-bfed0415a224}

Security Software

Type: Microsoft Defender Antivirus

Type:

Type:

Graphics

Features
Compositing: WebRender
Asynchronous Pan/Zoom: wheel input enabled; touch input enabled; scrollbar drag enabled; keyboard enabled; autoscroll enabled; smooth pinch-zoom enabled
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GPU #1
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Description: NVIDIA GeForce GTX 1050 Ti with Max-Q Design
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Device ID: 0x1c8c
Driver Version: 30.0.14.9649
Driver Date: 10-20-2021
Drivers: C:\WINDOWS\System32\DriverStore\FileRepository\nvdmi.inf_amd64_52c88f227879300f\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdmi.inf_amd64_52c88f227879300f\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdmi.inf_amd64_52c88f227879300f\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdmi.inf_amd64_52c88f227879300f\nvldumdx.dll C:\WINDOWS\System32\DriverStore\FileRepository\nvdmi.inf_amd64_52c88f227879300f\nvldumd.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdmi.inf_amd64_52c88f227879300f\nvldumd.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdmi.inf_amd64_52c88f227879300f\nvldumd.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdmi.inf_amd64_52c88f227879300f\nvldumd.dll
Subsys ID: 087c1028
RAM: 4096
GPU #2
Active: No
Description: Intel(R) UHD Graphics 630
Vendor ID: 0x8086
Device ID: 0x3e9b
Driver Version: 27.20.100.8681
Driver Date: 6-10-2021
Drivers: igdumdim64 igd10iumd64 igd10iumd64 igd12umd64 igdumdim32 igd10iumd32 igd10iumd32 igd12umd32
Subsys ID: 087c1028
RAM: 0
Diagnostics
AzureCanvasBackend: direct2d 1.1
AzureCanvasBackend (UI Process): skia
AzureContentBackend: skia
AzureContentBackend (UI Process): skia
AzureFallbackCanvasBackend (UI Process): skia
CMSOutputProfile: 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
Display0: 1920x1080@59Hz : Intel(R) UHD Graphics 630
Display1: 1920x1080@59Hz : Intel(R) UHD Graphics 630
Display2: 1920x1080@60Hz : Intel(R) UHD Graphics 630
DisplayCount: 3
HardwareStretching: both=0 window-only=0 full-screen-only=0 none=3 error=0
ScaledResolution0: source 1920x1080, target 3840x2160
ScaledResolutionCount: 1
GPUProcessPid: 18964
GPUProcess: Terminate GPU Process
Device Reset: Trigger Device Reset
ClearType Parameters: \.\DISPLAY1 [ Gamma: 1.8 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 50 ] \.\DISPLAY2 [ Gamma: 1.8 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 50 ] \.\DISPLAY3 [ Gamma: 1.8 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 50 ]
Decision Log
HW_COMPOSITING:
available by default
D3D11_COMPOSITING:
available by default
DIRECT2D:
available by default
D3D11_HW_ANGLE:
available by default
GPU_PROCESS:
available by default
WEBRENDER:
available by default
WEBRENDER_QUALIFIED:
available by default
WEBRENDER_COMPOSITOR:
available by default
unavailable by env: No hardware stretching support
WEBRENDER_PARTIAL:
available by default
WEBRENDER_SHADER_CACHE:
available by default
WEBRENDER_OPTIMIZED_SHADERS:
available by default
WEBRENDER_ANGLE:
available by default
WEBRENDER_DCOMP_PRESENT:
available by default
WEBRENDER_SOFTWARE:
available by default
WEBGPU:
disabled by default: Disabled by default
WINDOW_OCCLUSION:
available by default

Media

Audio Backend: wasapi
Max Channels: 2
Preferred Sample Rate: 48000
Roundtrip latency (standard deviation): 47.42ms (2.94)
Output Devices
Name: Group
Headset (HD 4.40BT Hands-Free AG Audio): BTHHFENUM\BthHFPAudio\8&28ab5152&6&97
Headset Earphone (ThinkPad USB-C Dock USB Audio): USB\VID_17EF&PID_3063&MI_00\9&35345568&0&0000
Speakers (Avantree DG80): USB\VID_0A12&PID_1004&MI_00\6&36072091&0&0000
Headset (Tornado Hands-Free AG Audio): BTHHFENUM\BthHFPAudio\8&a8a6361&0&97
Speakers (NVIDIA RTX Voice): ROOT\UNNAMED_DEVICE\0003
Acer CB271H (Intel(R) Display Audio): INTELAUDIO\FUNC_01&VEN_8086&DEV_280B&SUBSYS_80860101&REV_1000\4&2223f159&0&0201
Headphones (Tornado Stereo): BTHENUM{0000110b-0000-1000-8000-00805f9b34fb}_VID&000105d6_PID&000a\7&12b5b5ad&0&E441A23DC883_C00000000
Speakers (Steam Streaming Speakers): ROOT\SteamStreamingSpeakers\0000
Intel(R) Display Audio Output 1.2 (Intel(R) Display Audio): INTELAUDIO\FUNC_01&VEN_8086&DEV_280B&SUBSYS_80860101&REV_1000\4&2223f159&0&0201
Headphones (HD 4.40BT Stereo): BTHENUM{0000110b-0000-1000-8000-00805f9b34fb}_VID&00010a12_PID&0001\7&12b5b5ad&0&001694350EF9_C00000000
Acer CB271H (Intel(R) Display Audio): INTELAUDIO\FUNC_01&VEN_8086&DEV_280B&SUBSYS_80860101&REV_1000\4&2223f159&0&0201
Speakers/Headphones (Realtek(R) Audio): INTELAUDIO\FUNC_01&VEN_10EC&DEV_0298&SUBSYS_1028087C&REV_1001\4&2223f159&0&0001
Speakers (Steam Streaming Microphone): ROOT\SteamStreamingMicrophone\0000
Speakers/Headphones (Realtek(R) Audio): INTELAUDIO\FUNC_01&VEN_10EC&DEV_0298&SUBSYS_1028087C&REV_1001\4&2223f159&0&0001
Internal AUX Jack (Steam Streaming Speakers): ROOT\SteamStreamingSpeakers\0000
Input Devices
Name: Group
Microphone (Steam Streaming Microphone): ROOT\SteamStreamingMicrophone\0000
Stereo Mix (Realtek(R) Audio): INTELAUDIO\FUNC_01&VEN_10EC&DEV_0298&SUBSYS_1028087C&REV_1001\4&2223f159&0&0001
Headset Microphone (ThinkPad USB-C Dock USB Audio): USB\VID_17EF&PID_3063&MI_00\9&35345568&0&0000
Headset (Tornado Hands-Free AG Audio): BTHHFENUM\BthHFPAudio\8&a8a6361&0&97
Internal AUX Jack (Steam Streaming Speakers): ROOT\SteamStreamingSpeakers\0000
Microphone (NVIDIA RTX Voice): ROOT\UNNAMED_DEVICE\0003
Desktop Microphone (Microsoft® LifeCam Cinema(TM)): USB\VID_045E&PID_0812&MI_02\8&1b450f2f&0&0002
Headset (HD 4.40BT Hands-Free AG Audio): BTHHFENUM\BthHFPAudio\8&28ab5152&6&97
Stereo Mix (Realtek(R) Audio): INTELAUDIO\FUNC_01&VEN_10EC&DEV_0298&SUBSYS_1028087C&REV_1001\4&2223f159&0&0001
Microphone (Steam Streaming Speakers): ROOT\SteamStreamingSpeakers\0000
Microphone (Avantree DG80): USB\VID_0A12&PID_1004&MI_00\6&36072091&0&0000
Desktop Microphone (2- Microsoft® LifeCam Cinema(TM)): USB\VID_045E&PID_0812&MI_02\9&31a08ab9&1&0002
Microphone (Realtek(R) Audio): INTELAUDIO\FUNC_01&VEN_10EC&DEV_0298&SUBSYS_1028087C&REV_1001\4&2223f159&0&0001
Microphone (Realtek(R) Audio): INTELAUDIO\FUNC_01&VEN_10EC&DEV_0298&SUBSYS_1028087C&REV_1001\4&2223f159&0&0001
Media Capabilities
Enumerate database

Environment Variables

MOZ_CRASHREPORTER_DATA_DIRECTORY: C:\Users\davyd\AppData\Roaming\Mozilla\Firefox\Crash Reports
MOZ_CRASHREPORTER_EVENTS_DIRECTORY: C:\Users\davyd\AppData\Roaming\Mozilla\Firefox\Profiles\es7aethz.default-nightly-2\crashes\events
MOZ_CRASHREPORTER_PING_DIRECTORY: C:\Users\davyd\AppData\Roaming\Mozilla\Firefox\Pending Pings
MOZ_CRASHREPORTER_RESTART_ARG_0: C:\Program Files\Firefox Nightly\firefox.exe
MOZ_CRASHREPORTER_STRINGS_OVERRIDE: C:\Program Files\Firefox Nightly\browser\crashreporter-override.ini

Experimental Features

about:home startup cache (browser.startup.homepage.abouthome_cache.enabled): true
Cookies: SameSite=Lax by default (network.cookie.sameSite.laxByDefault): true
Cookies: SameSite=None requires secure attribute (network.cookie.sameSite.noneRequiresSecure): true
Cookies: Schemeful SameSite (network.cookie.sameSite.schemeful): true
CSS: Cascade Layers (layout.css.cascade-layers.enabled): true
CSS: Constructable Stylesheets (layout.css.constructable-stylesheets.enabled): false
CSS: Masonry Layout (layout.css.grid-template-masonry-value.enabled): true
Developer Tools: Compatibility Panel (devtools.inspector.compatibility.enabled): true
Developer Tools: Execution Context Selector (devtools.webconsole.input.context): true
Developer Tools: Service Worker debugging (devtools.debugger.features.windowless-service-workers): false
Fission (Site Isolation) (fission.autostart): true
Media: JPEG XL (image.jxl.enabled): false
Multiple Picture-in-Picture Support (media.videocontrols.picture-in-picture.allow-multiple): true
Address Bar: show results during IME composition (browser.urlbar.keepPanelOpenDuringImeComposition): false
Web API: WebGPU (dom.webgpu.enabled): false
WebRTC Global Mute Toggles (privacy.webrtc.globalMuteToggles): false
Win32k Lockdown (security.sandbox.content.win32k-disable): false

Remote Experiments

Important Modified Preferences

browser.contentblocking.category: standard
browser.download.useDownloadDir: false
browser.search.region: ZA
browser.sessionstore.upgradeBackup.latestBuildID: 20211112092317
browser.startup.homepage: about:blank
browser.startup.homepage_override.buildID: 20211112092317
browser.startup.homepage_override.mstone: 96.0a1
browser.startup.page: 3
browser.urlbar.placeholderName: DuckDuckGo
browser.urlbar.quicksuggest.migrationVersion: 1
browser.urlbar.quicksuggest.scenario: history
doh-rollout.balrog-migration-done: true
doh-rollout.doneFirstRun: true
doh-rollout.home-region: ZA
dom.push.userAgentID: aad67de3ba3b416e8699cc25658b4e9e
extensions.lastAppVersion: 96.0a1
idle.lastDailyNotification: 1636697286
media.gmp-gmpopenh264.abi: x86_64-msvc-x64
media.gmp-gmpopenh264.lastUpdate: 1636636032
media.gmp-gmpopenh264.version: 1.8.1.1
media.gmp-manager.buildID: 20211111211702
media.gmp-manager.lastCheck: 1636699870
media.gmp-widevinecdm.abi: x86_64-msvc-x64
media.gmp-widevinecdm.lastUpdate: 1636636034
media.gmp-widevinecdm.version: 4.10.2391.0
media.gmp.storage.version.observed: 1
media.hardware-video-decoding.failed: true
network.trr.blocklist_cleanup_done: true
places.database.lastMaintenance: 1636697287
privacy.purge_trackers.date_in_cookie_database: 0
privacy.purge_trackers.last_purge: 1636697286782
privacy.sanitize.pending: [{"id":"newtab-container","itemsToClear":[],"options":{}}]
security.default_personal_cert: Select Automatically
security.disable_button.openCertManager: false
security.remote_settings.crlite_filters.checked: 1636722308
security.remote_settings.intermediates.checked: 1636722308
security.sandbox.content.tempDirSuffix: {8590c2de-b4ea-4fbd-96f5-63ee3869478f}
services.sync.declinedEngines:
services.sync.engine.bookmarks.validation.lastTime: 1636722643
services.sync.engine.creditcards: true
services.sync.engine.passwords.validation.lastTime: 1636722643
services.sync.engine.prefs.modified: false
services.sync.lastPing: 1636722036
services.sync.lastSync: Fri Nov 12 2021 16:46:41 GMT+0200 (South Africa Standard Time)
signon.suggestImportCount: 2
storage.vacuum.last.index: 0
storage.vacuum.last.places.sqlite: 1636697286
ui.osk.debug.keyboardDisplayReason: IKPOS: Keyboard presence confirmed.

Important Locked Preferences

fission.autostart.session: true

Places Database

Accessibility

Activated: false
Prevent Accessibility: 0
Accessible Handler Used: true
Accessibility Instantiator:

Library Versions

NSPR
Expected minimum version: 4.32
Version in use: 4.32

NSS
Expected minimum version: 3.72
Version in use: 3.72

NSSSMIME
Expected minimum version: 3.72
Version in use: 3.72

NSSSSL
Expected minimum version: 3.72
Version in use: 3.72

NSSUTIL
Expected minimum version: 3.72
Version in use: 3.72

Sandbox

Content Process Sandbox Level: 6
Effective Content Process Sandbox Level: 6
Win32k Lockdown State for Content Process: Win32k Lockdown disabled -- Preference not set

Startup Cache

Disk Cache Path: C:\Users\davyd\AppData\Local\Mozilla\Firefox\Profiles\es7aethz.default-nightly-2\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-ZA"]
Default Locale: "en-US"
Operating System
System Locales: ["en-ZA","en-US"]
Regional Preferences: ["en-ZA"]

Remote Debugging (Chromium Protocol)

Accepting Connections: false
URL:

Printing

Modified print settings

Shows a partial render in firefox this morning. A few seconds after capturing this screenshot, the rest of the page rendered in. Before that, I could scroll past this point and back up again.

I even just got this in about:config - typing into the search bar, the list of matching items narrows and then just disappears. I found that pressing ctrl+space made them come back, but any further changes (delete a char, add a char) causes the whole pane to go blank. So I tried to come here to add a comment and this page did it - page appeared loaded, moving the mouse over the page shows cursor changes, I managed to click something to navigate, but the whole screen stayed blank. I went away to get my non-nightly firefox ready to use because I can't work like this, and when I came back, this page had rendered.

I'm assuming that since this affects about:config, it can't be from an extension?

Hi Davyd, thank you for the report.

Can you tell us a bit more about your setup? From the about:support info, I see three monitors and scaled resolution, is this correct?
I know this might be annoying to test out, but could you see if the issue persist with only one monitor with/without scaling?

We have had some issues with mixed refresh rate monitors in the past.

Hi Miko

Yes, three "monitors":

• laptop screen, native 4k, but I run at 1920x1080 because multiple scalings across monitors often doesn't work as expected (not all apps adjust their scaling properly when moving from one monitor to the other)
• 2x 27" monitors running at 1920x1080
• all screens running at 100% scale because of the issue outlined above

I can try just the laptop tomorrow for a while perhaps - I can't run all day though, as this severely impacts my productivity

Hi Miko

I switched to laptop only this morning, running 1920x1080, 100% scaling and found the issue almost immediately. For completeness' sake, I'm running the laptop display only at 4k with 200% scaling to see if that's any different.

Ok, initially, it seemed like the issue wasn't there, but I switched away from FF Nightly for a moment and when I came back, the pinned tab that was open was blank - I switched between all tabs to find blanks, switched back to settings to reset my default browser back to FF Vanilla, and when I switched back to Nightly, the pages had rendered again. So this issue doesn't seem to be affected by resolution, scaling or monitor counts.

Hi Davyd, can you check if pref "widget.windows.window_occlusion_tracking.enabled=false" address the problem for you?
pref could be changed from about:config. Thank you.

Hi Sotaro

I've been running Nightly with that setting for all of today and haven't seen the issue arise yet, so it's looking like that might provide a workaround or a hint as to where the issue lies.

Hi Davyd, thank you for checking it. It seems that bug 1732736 seemed to cause the regression.
I still could not reproduce the problem on my Win PCs, then I am still not sure which code caused the problem yet :(

Set release status flags based on info from the regressing bug 1732736

(In reply to Davyd McColl from comment #9)

Ok, initially, it seemed like the issue wasn't there, but I switched away from FF Nightly for a moment and when I came back, the pinned tab that was open was blank - I switched between all tabs to find blanks, switched back to settings to reset my default browser back to FF Vanilla, and when I switched back to Nightly, the pages had rendered again. So this issue doesn't seem to be affected by resolution, scaling or monitor counts.

This sounds similar to bug 1741297.

Davyd McColl, can you check if the problem is addressed with latest nightly?

I re-enabled widget.windows.window_occlusion_tracking.enabled and updated yesterday. So far, I haven't seen the issue come back. On the flip side, in the interim, I've had to reload my machine, so I've moved from win10 to win11 - I hope this hasn't affected the outcome.

Davyd McColl, good! Thank you for the confirmation.