Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

Type about:support in the address bar and press Enter. Under the main banner, press the button; Copy Text To Clipboard.. Now press the Reply button. In the Reply box do a right-click in the box and select Paste.

This will show us your system details. No Personal Information Is Collected.

Does it make any difference if you tap the Num Lock key several times?

Do you use any security software than has an "anti-keylogger" feature?

Application Basics

Name: Firefox Version: 54.0.1 Build ID: 20170628075643 Update Channel: release User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0 OS: Windows_NT 10.0 Multiprocess Windows: 1/1 (Enabled by default) Google Key: Found Mozilla Location Service Key: Found Safe Mode: true

Crash Reports for the Last 3 Days

All Crash Reports

Extensions

Name: Application Update Service Helper Version: 2.0 Enabled: true ID: aushelper@mozilla.org

Name: Firefox Screenshots Version: 6.6.0 Enabled: true ID: screenshots@mozilla.org

Name: Multi-process staged rollout Version: 1.50 Enabled: true ID: e10srollout@mozilla.org

Name: Pocket Version: 1.0.5 Enabled: true ID: firefox@getpocket.com

Name: Web Compat Version: 1.1 Enabled: true ID: webcompat@mozilla.org

Name: HTTPS Everywhere Version: 5.2.21 Enabled: false ID: https-everywhere@eff.org

Name: LastPass: Free Password Manager Version: 4.1.54 Enabled: false ID: support@lastpass.com

Name: Norton Security Toolbar Version: 2017.11.0.1 Enabled: false ID: {C1A2A613-35F1-4FCF-B27F-2840527B6556}

Name: NoScript Version: 5.0.8.1 Enabled: false ID: {73a6fe31-595d-460b-a920-fcc0f8843232}

Name: Privacy Settings Version: 0.2.6 Enabled: false ID: jid1-CKHySAadH4nL6Q@jetpack

Name: uBlock Origin Version: 1.13.8 Enabled: false ID: uBlock0@raymondhill.net

Graphics

Features Compositing: Basic Asynchronous Pan/Zoom: wheel input enabled; touch input 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: - WebGL2 Renderer: WebGL is currently disabled. WebGL 2 Driver Version: - WebGL 2 Driver Extensions: - WebGL 2 Extensions: - Audio Backend: wasapi DirectWrite: true (10.0.15063.413) GPU #1 Active: Yes Description: Intel(R) Iris(TM) Graphics 550 Vendor ID: 0x8086 Device ID: 0x1927 Driver Version: 21.20.16.4541 Driver Date: 10-20-2016 Drivers: igdumdim64 igd10iumd64 igd10iumd64 igd12umd64 igdumdim32 igd10iumd32 igd10iumd32 igd12umd32 Subsys ID: 01cf1b0a RAM: Unknown

Diagnostics AzureCanvasAccelerated: 0 AzureCanvasBackend: skia AzureContentBackend: skia AzureFallbackCanvasBackend: cairo failures: CP+[GFX1]: Potential driver version mismatch ignored due to missing DLLs igd10umd32 v= and igd10iumd32.dll v=0.0.0.0 Decision Log HW_COMPOSITING: blocked by runtime: Acceleration blocked by safe-mode D3D11_COMPOSITING: unavailable by default: Hardware compositing is disabled D3D9_COMPOSITING: unavailable by default: Hardware compositing is disabled DIRECT2D: unavailable by default: Direct2D requires Direct3D 11 compositing D3D11_HW_ANGLE: unavailable by default: D3D11 compositing is disabled disabled by env: D3D11 compositing is disabled GPU_PROCESS: blocked by runtime: Safe-mode is enabled WEBRENDER: unavailable by runtime: Build doesn't include WebRender

Failure Log (#0): CP+[GFX1]: Potential driver version mismatch ignored due to missing DLLs igd10umd32 v= and igd10iumd32.dll v=0.0.0.0 (#1): CP+[GFX1-]: ClientLayerManager::BeginTransaction with IPC channel down. GPU process may have died.

Important Modified Preferences

browser.cache.disk.capacity: 358400 browser.cache.disk.filesystem_reported: 1 browser.cache.disk.hashstats_reported: 1 browser.cache.disk.smart_size.first_run: false browser.cache.disk.smart_size.use_old_max: false browser.cache.frecency_experiment: 3 browser.download.importedFromSqlite: true browser.places.smartBookmarksVersion: 8 browser.sessionstore.upgradeBackup.latestBuildID: 20170628075643 browser.startup.homepage_override.buildID: 20170628075643 browser.startup.homepage_override.mstone: 54.0.1 browser.tabs.remote.autostart.2: true browser.urlbar.daysBeforeHidingSuggestionsPrompt: 3 browser.urlbar.lastSuggestionsPromptDate: 20170407 browser.urlbar.searchSuggestionsChoice: false browser.urlbar.userMadeSearchSuggestionsChoice: true extensions.lastAppVersion: 54.0.1 font.internaluseonly.changed: true gfx.crash-guard.d3d11layers.appVersion: 53.0 gfx.crash-guard.d3d11layers.deviceID: 0x1927 gfx.crash-guard.d3d11layers.driverVersion: 21.20.16.4541 gfx.crash-guard.d3d11layers.feature-d2d: true gfx.crash-guard.d3d11layers.feature-d3d11: true gfx.crash-guard.status.d3d11layers: 2 gfx.crash-guard.status.d3d11video: 2 media.benchmark.vp9.fps: 159 media.benchmark.vp9.versioncheck: 2 media.gmp-gmpopenh264.abi: x86-msvc-x64 media.gmp-gmpopenh264.lastUpdate: 1491516271 media.gmp-gmpopenh264.version: 1.6 media.gmp-manager.buildID: 20170628075643 media.gmp-manager.lastCheck: 1501784250 media.gmp-widevinecdm.abi: x86-msvc-x64 media.gmp-widevinecdm.lastUpdate: 1501784285 media.gmp-widevinecdm.version: 1.4.8.903 media.gmp.storage.version.observed: 1 media.hardware-video-decoding.failed: false media.webrtc.debug.log_file: C:\Users\Thomas\AppData\Local\Temp\WebRTC.log network.cookie.prefsMigrated: true network.dns.disablePrefetch: true network.http.sendSecureXSiteReferrer: false network.http.speculative-parallel-limit: 0 network.predictor.cleaned-up: true network.prefetch-next: false places.database.lastMaintenance: 1501715461 places.history.expiration.transient_current_max_pages: 93504 plugin.disable_full_page_plugin_for_types: application/pdf print.printer_Brother_HL-2250DN_series.print_bgcolor: false print.printer_Brother_HL-2250DN_series.print_bgimages: false print.printer_Brother_HL-2250DN_series.print_duplex: -437918235 print.printer_Brother_HL-2250DN_series.print_edge_bottom: 0 print.printer_Brother_HL-2250DN_series.print_edge_left: 0 print.printer_Brother_HL-2250DN_series.print_edge_right: 0 ...some lines removed for word limit... print.printer_Brother_HL-2250DN_series.print_reversed: false print.printer_Brother_HL-2250DN_series.print_scaling: 1.00 print.printer_Brother_HL-2250DN_series.print_shrink_to_fit: true print.printer_Brother_HL-2250DN_series.print_to_file: false print.printer_Brother_HL-2250DN_series.print_unwriteable_margin_bottom: 0 print.printer_Brother_HL-2250DN_series.print_unwriteable_margin_left: 0 print.printer_Brother_HL-2250DN_series.print_unwriteable_margin_right: 0 print.printer_Brother_HL-2250DN_series.print_unwriteable_margin_top: 0 print.printer_Microsoft_Print_to_PDF.print_bgcolor: false print.printer_Microsoft_Print_to_PDF.print_bgimages: false print.printer_Microsoft_Print_to_PDF.print_duplex: -437918235 print.printer_Microsoft_Print_to_PDF.print_edge_bottom: 0 print.printer_Microsoft_Print_to_PDF.print_edge_left: 0 print.printer_Microsoft_Print_to_PDF.print_edge_right: 0 print.printer_Microsoft_Print_to_PDF.print_edge_top: 0 print.printer_Microsoft_Print_to_PDF.print_evenpages: true print.printer_Microsoft_Print_to_PDF.print_footercenter: print.printer_Microsoft_Print_to_PDF.print_footerleft: &PT print.printer_Microsoft_Print_to_PDF.print_footerright: &D print.printer_Microsoft_Print_to_PDF.print_headercenter: print.printer_Microsoft_Print_to_PDF.print_headerleft: &T print.printer_Microsoft_Print_to_PDF.print_headerright: &U print.printer_Microsoft_Print_to_PDF.print_in_color: true print.printer_Microsoft_Print_to_PDF.print_margin_bottom: 0.5 print.printer_Microsoft_Print_to_PDF.print_margin_left: 0.5 print.printer_Microsoft_Print_to_PDF.print_margin_right: 0.5 print.printer_Microsoft_Print_to_PDF.print_margin_top: 0.5 print.printer_Microsoft_Print_to_PDF.print_oddpages: true print.printer_Microsoft_Print_to_PDF.print_orientation: 0 print.printer_Microsoft_Print_to_PDF.print_page_delay: 50 print.printer_Microsoft_Print_to_PDF.print_paper_data: 1 print.printer_Microsoft_Print_to_PDF.print_paper_height: -1.00 print.printer_Microsoft_Print_to_PDF.print_paper_name: print.printer_Microsoft_Print_to_PDF.print_paper_size_unit: 0 print.printer_Microsoft_Print_to_PDF.print_paper_width: -1.00 print.printer_Microsoft_Print_to_PDF.print_resolution: 600 print.printer_Microsoft_Print_to_PDF.print_reversed: false print.printer_Microsoft_Print_to_PDF.print_scaling: 1.00 print.printer_Microsoft_Print_to_PDF.print_shrink_to_fit: true print.printer_Microsoft_Print_to_PDF.print_to_file: false print.printer_Microsoft_Print_to_PDF.print_unwriteable_margin_bottom: 0 print.printer_Microsoft_Print_to_PDF.print_unwriteable_margin_left: 0 print.printer_Microsoft_Print_to_PDF.print_unwriteable_margin_right: 0 print.printer_Microsoft_Print_to_PDF.print_unwriteable_margin_top: 0 privacy.trackingprotection.introCount: 20 security.sandbox.content.tempDirSuffix: {2d28d10b-6e44-44d0-99ce-ea857954fbf2} services.sync.declinedEngines: storage.vacuum.last.index: 1 storage.vacuum.last.places.sqlite: 1499807197 ui.osk.debug.keyboardDisplayReas

Thanks for the replies. I have posted the requested information above. The numbers seem to be working in safe mode. Tapping NumLock makes no difference, but I am using Spy Shelter, which recently updated to 10.9.3. I can't recall whether that coincided with the onset of the issue.

It could be the work of one of your add-ons. Type about:addons<enter> in the address bar to open your Add-ons Manager. Hot key; <Control> (Mac=<Command>) <Shift> A)

In the Add-ons Manager, on the left, select Extensions. Disable a few add-ons, then Restart Firefox.

Some added toolbar and anti-virus add-ons are known to cause Firefox issues. Disable All Of them.

If the problem continues, disable some more (restarting FF). Continue until the problem is gone. After, you know what group is causing the issue. Re-enable the last group ONE AT A TIME (restarting FF) until the problem returns.

Once you think you found the problem, disable that and re-enable all the others, then restart again. Let us know who the suspect is, detective.

Thanks again. The problem seems to be with LastPass enabled.

Contact their support.