Hey Paul, could you add in which websites you encounter that issue?

Hello Konstantina, thanks for following this up.

I had been seeing a few of these in recent days and running out of time and patience I posted the question to Mozilla.

What I now realise is that the page concerned was a pdf:

https://s3-eu-west-1.amazonaws.com/assets.trustintelligence.co.uk/uploads/retail_Fidelity_European__FEV__March_2026.pdf?X-Amz-Expires=600&X-Amz-Date=20260313T143456Z&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIARODODTT2RLWEIQML%2F20260313%2Feu-west-1%2Fs3%2Faws4_request&X-Amz-SignedHeaders=host&X-Amz-Signature=eaf93e09224a8fff56be71230e103f5e5dce3f2f869f7d7f85e176a18e054b08

So maybe I should be looking at Adobe as the source of the problem not the browser?

Regards Paul

OK I have found a solution of sorts. I downloaded the pdf reader extension for Firefox which allows me to nominate Adobe Reader as the preferred reader for pdf files. The site on which I had this problem now redirects to Adobe Reader and the problem has gone. Great! But the problem still remains with some other sites where pdf reader does not redirect as above, which is a shame but at least a partial victory and now at least I know the source of the problem.

Windows 11, Firefox 148.0.2 64 bit, any .pdf, default viewer .pdf opens OK in Chrome Unable to view .pdf options as e-sig box overlays and has no close option nor will it move or scroll

I agree Glenn, that is the problem. Why does it not occur on Chrome but on Firefox? I don't want to stop using Firefox but this is a very tedious consequence of using Firefox for some sites (pdf reader does deal with this for other sites).

Hey Paul and Glenn, thanks for getting back to me. Could you share another .pdf that this is happening? The one shared at the beginning is not accessible.

OK will do.

The following website has lots of pdfs accessible from it:

https://find-and-update.company-information.service.gov.uk/company/00539850/filing-history

Click on any of the pdfs listed on the right hand side of the screen, that should show you the problem.

Hello Paul, I have tried to reproduce on Mac but I couldn't. I also talked with an engineer and he can't reproduce on Windows either - so I am thinking this can be caused by an addon. To figure this out, can you start your Firefox on troubleshoot mode? Here are the instructions:

Firefox Troubleshoot Mode (previously known as Firefox Safe Mode) is a special diagnostic mode that temporarily turns off hardware acceleration, disables add-ons (extensions and themes) and resets some settings. See the Use Troubleshoot Mode in Firefox article for details.

If Firefox is open, you can restart in Firefox Troubleshoot Mode from the Help menu:

• Click the menu button , click Help, select Troubleshoot Mode and click Restart in the "Restart Firefox in Troubleshoot Mode?" dialog that opens.

If Firefox is not running, you can start Firefox in Troubleshoot Mode as follows:

• On Windows: Hold the Shift key when you open the Firefox desktop or Start menu shortcut.
• On Mac: Hold the option key while starting Firefox.
• On Linux: Quit Firefox, go to your Terminal and run firefox -safe-mode
  (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)

When the Firefox Troubleshoot Mode window appears, select "Open".

If the issue is not present in Firefox Troubleshoot Mode, your problem is probably caused by an extension, theme or hardware acceleration. Please follow the steps in the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article to find the cause.

To exit Firefox Troubleshoot Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again. (If you can't exit Firefox Troubleshoot Mode, please see Firefox is stuck in Troubleshoot Mode).

When you figure out what's causing your issues, please let us know. It might help others with the same problem.

Tried that a couple of times but it made no difference!

Ok let's try to see exactly your configuration. I will ask you to give me some more non-personal information. Please do the following:

1. Use ONE of these methods to open the Firefox Troubleshooting Information page:
   • Click the menu button , click on Help and select More troubleshooting information.
   • Type about:support into the Firefox address bar and press the enter key.
2. At the top of the Troubleshooting Information page that comes up, you should see a button that says "Copy text to clipboard". Click it.
3. Now, go back to your forum post, right-click in the reply box and select Paste from the context menu (or else click inside the reply box and press the Ctrl+V keys) to paste the information you copied into the forum post.
   • Due to a forum reply character limit, only part of the data may be pasted. You can use your mouse to select the missing text from the about:support page, right-click on the page to copy it and then right-click in the forum reply box to paste it into a new reply.

Note: The Troubleshooting Information page does not contain personal data, except for the full path to your profile folder. When you use one of the "Copy to clipboard" buttons, the profile path is not copied. Use other tools and methods at your own risk.

If you need further information about the Troubleshooting information page, please read the article Use the Troubleshooting Information page to help fix Firefox issues.

Application Basics

Name: Firefox Version: 148.0.2 Build ID: 20260309125808 Distribution ID: Update Channel: release User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:148.0) Gecko/20100101 Firefox/148.0 OS: Windows_NT 10.0 26200 Launcher Process: Enabled Multiprocess Windows: 1/1 Fission Windows: 1/1 Enabled by default Remote Processes: 11 Enterprise Policies: Inactive Google Location Service Key: Found Google Safebrowsing Key: Found Mozilla Location Service Key: Found Safe Mode: false Memory Size (RAM): 15.6 GB Disk Space Available: 45.1 GB Pointing Devices: Mouse

Crash Reports for the Last 3 Days

Remote Features

bug-1693420-rollout-sponsored-top-sites-rollout-release-84-100: active bug-1712189-rollout-keep-firefox-up-to-date-even-when-it-is-not-ru-release-90-94: active bug-1766468-rollout-win32k-rollout-release-100-101: active bug-1766618-rollout-disable-websocket-over-http2-release-91-100: active bug-1802286-rollout-fix-webcompat-shim-breakage-release-103-107: active 1-Callout Contextual Chatbot Suggestion Treatment A Rollout V2: (treatment-a-tab-switching-copy) Account adoption callout - credit cards - treatment-c rollout: (treatment-c) Account adoption callout for Bookmarks - Global Rollout: (treatment) Acct adoption callout - addresses rollout with no PXI exclusion: (treatment-a) AI Chatbot Page Summarization MVP - treatment-a-callout-badge Rollout V4: (treatment-a-callout-badge) BackgroundUpdate: Enable unelevated installations (Rollout) -- 3-release: (enabled) Client Side Sampling of Performance Metrics: (control) Context ID rotation every 3 days: (control) Desktop Address Autofill - UK (Release | Rollout): (treatment-a) Desktop Release Rollout: Show Relay to all Browsers - "Next" Sign-up modal CTA: (next-sign-up-modal-cta) Downsample uptake.remotecontent events glean feature: (control) Enable Enrollment Status Telemetry for Firefox Desktop (via nimbusTelemetry): (control) Enable Nimbus Unenrollment Synchronization: (control) Enable OHTTP for MARS communications on Release: (control) Encrypted Client Hello - Fallback Mechanism: (control) Limit use of OCSP - Rollout: (enforce) Fast UDP for Firefox - Treatment Fast UDP Release Rollout: (treatment-fast-udp) Firefox Backup feature gradual rollout: (treatment) Fox Doodle Multi-Action CTA 2025 - Rollout: (treatment-a) Fx Accounts Ping (release rollout 2): (control) HNT Weather opt-in, Release: (control) Mozilla VPN in Private Browsing - Treatment D Rollout (EN only): (treatment-d) Multiple Profile Switching Rollout V2: (treatment-a-multi-profiles) New Tab 150.1.20260304.231049 to Release 148: (rollout) New Tab content ping (rest of world rollout): (treatment) PDF Annotations Signatures - Treatment A - Already Default Rollout: (treatment-a) Pin Frequently Used Websites - Promo Rollout, Day 3+ users, All Locales: (rollout-branch) Private Window Visual Refresh - rollout: (control) Roll out Expanded sign-in PXI toolbar button w/callout (Signed out): (sign-in-with-call-out) Sections + Personalization + Customization Rollout in the UK: (sections) Set to Default - Hamburger Menu Rollout: (treatment-c) Smart shortcuts v3-lr2 - no-lr Rollout: (no-lr) TOU Experience 0 rollout non-US: (control) Unified API for spocs and top sites - controlled rollout for release 133+: (control) Visual Card updates: (updated) Windows UI Automation release rollout: (rollout)

Remote Processes

Type: Preallocated Count: 3

Type: GPU Count: 1

Type: RDD Count: 1

Type: Privileged About Count: 1

Type: Socket Count: 1

Type: Extension Count: 1

Type: Isolated Web Content Count: 1

Type: Utility JavaScript Oracle Count: 1

Type: Utility Media Foundation Engine Count: 1

Add-ons

Name: British English Dictionary (Marco Pinto) Type: dictionary Version: 4.0.6 Enabled: true Location: app-profile ID: marcoagpinto@mail.telepac.pt

Name: Add-ons Search Detection Type: extension Version: 3.0.0 Enabled: true Location: app-builtin-addons ID: addons-search-detection@mozilla.com

Name: Data Leak Blocker Type: extension Version: 144.0.0 Enabled: true Location: app-builtin-addons ID: data-leak-blocker@mozilla.com

Name: DuckDuckGo Privacy Essentials Type: extension Version: 2026.1.12 Enabled: true Location: app-profile ID: jid1-ZAdIEUB7XOzOJw@jetpack

Name: Form Autofill Type: extension Version: 1.0.1 Enabled: true Location: app-builtin-addons ID: formautofill@mozilla.org

Name: IPP Activator Type: extension Version: 0.1 Enabled: true Location: app-builtin-addons ID: ipp-activator@mozilla.com

Name: New Tab Type: extension Version: 150.1.20260304.231049 Enabled: true Location: app-profile ID: newtab@mozilla.org

Name: Open in PDF Reader Type: extension Version: 0.3.7 Enabled: true Location: app-profile ID: {0d3afca0-aedf-491f-b0f9-9ffc22113ea8}

Name: Picture-In-Picture Type: extension Version: 1.0.0 Enabled: true Location: app-builtin-addons ID: pictureinpicture@mozilla.org

Name: Web Compatibility Interventions Type: extension Version: 149.7.20260211.154938 Enabled: true Location: app-system-addons ID: webcompat@mozilla.org

Name: Language: English (GB) Type: locale Version: 148.0.20260309.125808 Enabled: true Location: app-profile ID: langpack-en-GB@firefox.mozilla.org

Name: System theme — auto Type: theme Version: 1.4.2 Enabled: true Location: app-builtin ID: default-theme@mozilla.org

Name: Dark Type: theme Version: 1.3.4 Enabled: false Location: app-builtin ID: firefox-compact-dark@mozilla.org

Name: Firefox Alpenglow Type: theme Version: 1.5.1 Enabled: false Location: app-builtin ID: firefox-alpenglow@mozilla.org

Name: Light Type: theme Version: 1.3.4 Enabled: false Location: app-builtin ID: firefox-compact-light@mozilla.org

Security Software

Type: Norton 360

Type:

Type: Norton 360

Legacy User Stylesheets

Active: false Stylesheets: No stylesheets found

Graphics

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DirectWrite true (10.0.26100.7824) GPU #1 Active Yes Description Intel(R) UHD Graphics 750 Vendor ID 0x8086 Device ID 0x4c8a Driver Version 32.0.101.6078 Driver Date 9-13-2024 Drivers igdumdim64 igd10iumd64 igd10iumd64 igd12umd64 igdumdim32 igd10iumd32 igd10iumd32 igd12umd32 Subsys ID 09c51028 RAM 0 GPU #2 Active No Description NVIDIA GeForce RTX 3060 Ti Vendor ID 0x10de Device ID 0x2486 Driver Version 32.0.15.8195 Driver Date 11-18-2025 Drivers C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_de5ebdc446e3511a\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_de5ebdc446e3511a\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_de5ebdc446e3511a\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_de5ebdc446e3511a\nvldumdx.dll C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_de5ebdc446e3511a\nvldumd.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_de5ebdc446e3511a\nvldumd.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_de5ebdc446e3511a\nvldumd.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_de5ebdc446e3511a\nvldumd.dll Subsys ID 39711028 RAM 8192 Diagnostics AzureCanvasBackend skia AzureCanvasBackend (UI Process) skia AzureContentBackend skia AzureContentBackend (UI Process) skia AzureFallbackCanvasBackend (UI Process) skia CMSOutputProfile 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Display0 1920x1080@60Hz scales:1.000000|2.475000 DisplayCount 1 HardwareStretching both=1 window-only=0 full-screen-only=0 none=0 error=0 OverlaySupport NV12=Scaling YUV2=Scaling BGRA8=Software RGB10A2=Scaling RGBA16F=None VpSR=Not Supported VpAutoHDR=Not Supported HDR=Supported SwapChainTearingSupport Supported GPUProcessPid 42768 ClearType Parameters Gamma: 1.8 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 50 Font Visibility Debug Info Windows Platform Decision Log HW_COMPOSITING default available D3D11_COMPOSITING default available D3D11_HW_ANGLE default available GPU_PROCESS default available WEBRENDER default available WEBRENDER_COMPOSITOR default available WEBRENDER_PARTIAL default available WEBRENDER_SHADER_CACHE default available WEBRENDER_OPTIMIZED_SHADERS default available WEBRENDER_ANGLE default available WEBRENDER_DCOMP_PRESENT default available WEBRENDER_SCISSORED_CACHE_CLEARS default available env blocklisted Blocklisted by gfxInfo Blocklisted due to known issues: bug 1603515 WEBGPU default available WINDOW_OCCLUSION default available HARDWARE_VIDEO_DECODING default available HARDWARE_VIDEO_ENCODING default available VIDEO_HARDWARE_OVERLAY default available VIDEO_SOFTWARE_OVERLAY default available HW_DECODED_VIDEO_ZERO_COPY default available VP8_HW_DECODE default available VP9_HW_DECODE default available REUSE_DECODER_DEVICE default blocked Blocklisted by gfxInfo Blocklisted due to known issues: bug 1896823 BACKDROP_FILTER default available CANVAS_RENDERER_THREAD default available ACCELERATED_CANVAS2D default available H264_HW_DECODE default available AV1_HW_DECODE default available HEVC_HW_DECODE default available VP8_HW_ENCODE default available VP9_HW_ENCODE default available H264_HW_ENCODE default available AV1_HW_ENCODE default available HEVC_HW_ENCODE default available WMF_HW_DRM default available GL_NORM16_TEXTURES default available WEBGPU_EXTERNAL_TEXTURE default available Media Audio Backend wasapi Max Channels 2 Preferred Sample Rate 48000 Roundtrip latency (standard deviation) NaNms (NaN) Codec Support Information Codec Name Software Decoding Hardware Decoding Software Encoding Hardware Encoding H264 Supported Supported Unsupported Unsupported VP9 Supported Supported Unsupported Unsupported VP8 Supported Supported Unsupported Unsupported AV1 Supported Supported Unsupported Unsupported HEVC Unsupported Supported Unsupported Unsupported AAC Supported Unsupported Unsupported Unsupported MP3 Supported Unsupported Unsupported Unsupported Opus Supported Unsupported Unsupported Unsupported Vorbis Supported Unsupported Unsupported Unsupported FLAC Supported Unsupported Unsupported Unsupported Wave Supported Unsupported Unsupported Unsupported Output Devices Name Group Vendor State Preferred Format Channels Rate Latency Speakers (Realtek(R) Audio) HDAUDIO\FUNC_01&VEN_10EC&DEV_0899&SUBSYS_102809C5&REV_1000\4&1bc5d9f1&0&0001 Enabled All default: F32LE, support: S16LE F32LE 2 default: 48000, support: 48000 - 48000 144 - 480 Input Devices Name Group Vendor State Preferred Format Channels Rate Latency Microphone (Logi C270 HD WebCam) USB\VID_046D&PID_0825&MI_02\6&1e2afdec&0&0002 Enabled All default: F32LE, support: S16LE F32LE 1 default: 48000, support: 48000 - 48000 144 - 480 Stereo Mix (Realtek(R) Audio) HDAUDIO\FUNC_01&VEN_10EC&DEV_0899&SUBSYS_102809C5&REV_1000\4&1bc5d9f1&0&0001 Disabled None default: F32LE, support: S16LE F32LE 2 default: 48000, support: 48000 - 48000 0 - 0 Content Decryption Modules Information Key System Name Video Robustness Audio Robustness Capabilities Clear Lead org.w3.clearkey {"persistent":"Optional","distinctive":"NotAllowed","sessionType":"[Temporary]","codec":{"decodingAndDecrypting":["h264(all)"],"decryptingOnly":["aac(all)","flac(all)","opus(all)","vp9(all)","av1(all)","vorbis(all)","vp8(all)"]}} No com.widevine.alpha SW_SECURE_CRYPTO,SW_SECURE_DECODE SW_SECURE_CRYPTO {"persistent":"Optional","distinctive":"NotAllowed","sessionType":"[Temporary]","codec":{"decodingAndDecrypting":["h264(all)","vp9(all)","av1(all)","vp8(all)"],"decryptingOnly":["aac(all)","flac(all)","opus(all)","vorbis(all)"]}} Yes com.microsoft.playready.recommendation 2000 2000 {"persistent":"Required","distinctive":"Required","sessionType":"[Temporary,PersistentLicense]","codec":{

I'm lost now - dont know how far I have got!

Will have to leave shortly

Thank you Paul and for the replies - I know this can get frustrating and we are trying to debug this Firefox Engineers. Could you check the screenshot and tell me if that's what you're seeing?