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?

While still in Safe Mode,

Type about:support in the address bar and press Enter. Under the main banner, press the button; Copy Text To Clipboard.. Then in the reply box at the bottom of this page, do a right click in the box and select Paste. This will show us your system details. No Personal Information Is Collected.

and

In the address bar, type about:crashes<enter>. Note: If any reports do not have BP in front of the numbers/letters, click it to submit them.

The crash report is several pages of data. We need the report numbers to see the whole report.

Using your mouse, mark the most resent 7 - 10 crash reports, and copy them. Now go to the reply box below and paste them in.

Does this still happen if you disconnect Sync in case you are using it?

Previously, after disabling all Extensions and setting all Plugins to Ask, Firefox worked fine. I noticed that after entering my master password, the CPU and network access (for Firefox in Task Manager) would be about 13% and 1% respectively. After about 10 minutes everything settled down. I re-enabled the iCloud (Apple) Bookmarks sync and AdBlock extensions and everything seemed okay initially. I don't recall using it much since then though - I think I avoided Firefox as it was having this delay (kind of like a pause/hang) before it was available to use sometimes after launching it and I didn't have time to worry about it so I just switched to the other browsers.

This evening I thought I'd have another go. This time Firefox would become unresponsive within a couple of seconds of opening. I was just about able to make it to disable AdBlock but I couldn't get iCloud bookmarks to disable before the hang would kick in.

I deleted %AppData% Roaming and Local Mozilla folders as I just wanted to get back in. Then, of course, it was fine. Once I saw your requests for information, I restored the Roaming aand Local Mozilla folders to collect information and now when I relaunched, extensions are all disabled and plugins set to ask and Firefox seems to have settled.

The content of the about:support is too long for the reply. I copied it to a text file but I can't attach files.

The crash reports: bp-afd23713-5b72-45a5-ad05-1abf62160516 16/05/2016 23:12 bp-4f6db8cb-5ec1-4c28-a590-5db622160516 16/05/2016 23:12 bp-c3574bda-89bc-47cf-9c8a-3a5712160516 16/05/2016 23:11 bp-b1fbf83d-42dc-46d0-85a0-766fc2160516 16/05/2016 23:10 bp-4dec0d3a-aba6-4ca9-9aef-1503d2160514 14/05/2016 22:16 bp-2d594814-65d7-4bac-94b9-5b3ff2160512 12/05/2016 14:09 bp-dc2ce5bb-150f-4b8f-a121-4ea182160512 12/05/2016 14:06 bp-cb9f63cf-1859-4cd6-b0a5-b91f42160511 11/05/2016 14:08 bp-971536bc-0cb0-4f79-9e2e-436162160511 11/05/2016 13:46

I don't want to waste anyone's time so I'm okay with resetting to defaults. I am using the Mozilla Sync functionality, so I expect my settings to return anyway. If I do end up resetting, I'll watch to see if the sync brings the problem back and post a message.

I'll also try and get the about:support stuff up.

Thanks for having a go.

Application Basics

Name: Firefox Version: 46.0.1 Build ID: 20160502172042 Update Channel: release User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0 Multiprocess Windows: 0/1 (Disabled) Safe Mode: false

Crash Reports for the Last 3 Days

Report ID: bp-afd23713-5b72-45a5-ad05-1abf62160516 Submitted: 11 minutes ago

Report ID: bp-4f6db8cb-5ec1-4c28-a590-5db622160516 Submitted: 11 minutes ago

Report ID: bp-c3574bda-89bc-47cf-9c8a-3a5712160516 Submitted: 12 minutes ago

Report ID: bp-b1fbf83d-42dc-46d0-85a0-766fc2160516 Submitted: 13 minutes ago

Report ID: bp-4dec0d3a-aba6-4ca9-9aef-1503d2160514 Submitted: 2 days ago

All Crash Reports

Extensions

Name: Firefox Hello Version: 1.2.6 Enabled: true ID: loop@mozilla.org

Name: Multi-process staged rollout Version: 1.0 Enabled: true ID: e10srollout@mozilla.org

Name: Pocket Version: 1.0 Enabled: true ID: firefox@getpocket.com

Name: Adblock Plus Version: 2.7.3 Enabled: false ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}

Name: Amazon Assistant for Firefox Version: 10.1604.8.747 Enabled: false ID: abb@amazon.com

Name: Bitdefender QuickScan Version: 0.9.9.147.1-signed Enabled: false ID: {e001c731-5e37-4538-a5cb-8168736a2360}

Name: Firebug Version: 2.0.16 Enabled: false ID: firebug@software.joehewitt.com

Name: iCloud Bookmarks Version: 1.4.22 Enabled: false ID: firefoxdav@icloud.com

Graphics

Adapter Description: Intel(R) HD Graphics 4600 Adapter Description (GPU #2): NVIDIA GeForce GT 750M Adapter Drivers: igdumdim64 igd10iumd64 igd10iumd64 igd12umd64 igdumdim32 igd10iumd32 igd10iumd32 igd12umd32 Adapter Drivers (GPU #2): nvd3dumx,nvwgf2umx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um,nvwgf2um Adapter RAM: Unknown Adapter RAM (GPU #2): 2048 Asynchronous Pan/Zoom: none Device ID: 0x0416 Device ID (GPU #2): 0x0fe4 Direct2D Enabled: true DirectWrite Enabled: true (10.0.10586.0) Driver Date: 8-11-2015 Driver Date (GPU #2): 4-27-2016 Driver Version: 10.18.15.4271 Driver Version (GPU #2): 10.18.13.6510 GPU #2 Active: false GPU Accelerated Windows: 1/1 Direct3D 11 (OMTC) Subsys ID: 05fe1028 Subsys ID (GPU #2): 05fe1028 Supports Hardware H264 Decoding: Yes Vendor ID: 0x8086 Vendor ID (GPU #2): 0x10de WebGL Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 4600 Direct3D11 vs_5_0 ps_5_0) windowLayerManagerRemote: true AzureCanvasBackend: direct2d 1.1 AzureContentBackend: direct2d 1.1 AzureFallbackCanvasBackend: cairo AzureSkiaAccelerated: 0

Important Modified Preferences

accessibility.lastLoadDate: 1462597614 accessibility.loadedInLastSession: true accessibility.typeaheadfind.flashBar: 0 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: 1 browser.download.folderList: 2 browser.download.importedFromSqlite: true browser.download.manager.alertOnEXEOpen: true browser.download.useDownloadDir: false browser.places.smartBookmarksVersion: 7 browser.sessionstore.upgradeBackup.latestBuildID: 20160502172042 browser.startup.homepage: http://www.nationalgallery.ie browser.startup.homepage_override.buildID: 20160502172042 browser.startup.homepage_override.mstone: 46.0.1 browser.tabs.remote.disabled-for-a11y: true browser.urlbar.suggest.searches: true browser.urlbar.userMadeSearchSuggestionsChoice: true dom.apps.reset-permissions: true dom.mozApps.used: true extensions.lastAppVersion: 46.0.1 font.internaluseonly.changed: true gfx.crash-guard.d3d11layers.appVersion: 46.0.1 gfx.crash-guard.d3d11layers.deviceID: 0x0416 gfx.crash-guard.d3d11layers.driverVersion: 10.18.15.4271 gfx.crash-guard.d3d11layers.feature-d2d: true gfx.crash-guard.d3d11layers.feature-d3d11: true gfx.crash-guard.glcontext.gfx.driver-init.direct3d11-angle: true gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle: true gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle-force-d3d11: false gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle-force-warp: false gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle-try-d3d11: true gfx.crash-guard.status.d3d11layers: 2 gfx.crash-guard.status.d3d9video: 2 gfx.crash-guard.status.glcontext: 2 gfx.direct3d.last_used_feature_level_idx: 0 gfx.driver-init.appVersion: 42.0 gfx.driver-init.deviceID: 0x0416 gfx.driver-init.driverVersion: 10.18.15.4271 gfx.driver-init.feature-d2d: true gfx.driver-init.feature-d3d11: true gfx.driver-init.status: 2 media.gmp-eme-adobe.abi: x86-msvc-x64 media.gmp-eme-adobe.lastUpdate: 1462597714 media.gmp-eme-adobe.version: 17 media.gmp-gmpopenh264.abi: x86-msvc-x64 media.gmp-gmpopenh264.enabled: true media.gmp-gmpopenh264.lastUpdate: 1455629392 media.gmp-gmpopenh264.version: 1.5.3 media.gmp-manager.buildID: 20160502172042 media.gmp-manager.lastCheck: 1463437341 media.hardware-video-decoding.failed: false media.webrtc.debug.aec_log_dir: C:\Users\Stephen\AppData\Local\Temp media.webrtc.debug.log_file: C:\Users\Stephen\AppData\Local\Temp\WebRTC.log media.youtube-ua.override.to: 43 network.cookie.prefsMigrated: true network.predictor.cleaned-up: true places.database.lastMaintenance: 1462871703 places.history.expiration.transient_current_max_pages: 104858 plugin.disable_full_page_plugin_for_types: application/pdf plugin.importedState: true plugin.state.flash: 1 plugin.state.npatgpc: 1 plugin.state.npctrl: 1 plugin.state.npdeployjava: 1 plugin.state.npgoogleupdate: 1 plugin.state.npintelwebapiipt: 1 plugin.state.npintelwebapiupdater: 1 plugin.state.npitunes: 1 plugin.state.npmedia: 1 plugin.state.npmeetingjoinpluginoc: 1 plugin.state.npqscan: 0 plugin.state.npqtplugin: 1 plugin.state.npspwrap: 1 plugin.state.nptimegrid: 1 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: 9 print.printer_Microsoft_Print_to_PDF.print_paper_height: 11.00 print.printer_Microsoft_Print_to_PDF.print_paper_name: print.printer_Microsoft_Print_to_PDF.print_paper_size_type: 0 print.printer_Microsoft_Print_to_PDF.print_paper_size_unit: 1 print.printer_Microsoft_Print_to_PDF.print_paper_width: 8.50 print.printer_Microsoft_Print_to_PDF.print_resolution: -437918235 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 print.printer_WebEx_Document_Loader.print_bgcolor: false print.printer_WebEx_Document_Loader.print_bgimages: false print.printer_WebEx_Document_Loader.print_duplex: -437918235 print.printer_WebEx_Document_Loader.print_edge_bottom: 0 print.printer_WebEx_Document_Loader.print_edge_left: 0 print.printer_WebEx_Document_Loader.print_edge_right: 0 print.printer_WebEx_Document_Loader.print_edge_top: 0 print.printer_WebEx_Document_Loader.print_evenpages: true print.printer_WebEx_Document_Loader.print_footercenter: print.printer_WebEx_Document_Loader.print_footerleft: &PT print.printer_WebEx_Document_Loader.print_footerright: &D print.printer_WebEx_Document_Loader.print_headercenter: print.printer_WebEx_Document_Loader.print_headerleft: &T print.printer_WebEx_Document_Loader.print_headerright: &U print.printer_WebEx_Document_Loader.print_in_color: true print.printer_WebEx_Document_Loader.print_margin_bottom: 0.5 print.printer_WebEx_Document_Loader.print_margin_left: 0.5 print.printer_WebEx_Document_Loader.print_margin_right: 0.5 print.printer_WebEx_Document_Loader.print_margin_top: 0.5 print.printer_WebEx_Document_Loader.print_oddpages: true print.printer_WebEx_Document_Loader.print_orientation: 0 print.printer_WebEx_Document_Loader.print_page_delay: 50 print.printer_WebEx_Document_Loader.print_paper_data: 9 print.printer_WebEx_Document_Loader.print_paper_height: 11.00 print.printer_WebEx_Document_Loader.print_paper_name:

print.printer_Microsoft_Print_to_PDF.print_paper_name: print.printer_Microsoft_Print_to_PDF.print_paper_size_type: 0 print.printer_Microsoft_Print_to_PDF.print_paper_size_unit: 1 print.printer_Microsoft_Print_to_PDF.print_paper_width: 8.50 print.printer_Microsoft_Print_to_PDF.print_resolution: -437918235 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 print.printer_WebEx_Document_Loader.print_bgcolor: false print.printer_WebEx_Document_Loader.print_bgimages: false print.printer_WebEx_Document_Loader.print_duplex: -437918235 print.printer_WebEx_Document_Loader.print_edge_bottom: 0 print.printer_WebEx_Document_Loader.print_edge_left: 0 print.printer_WebEx_Document_Loader.print_edge_right: 0 print.printer_WebEx_Document_Loader.print_edge_top: 0 print.printer_WebEx_Document_Loader.print_evenpages: true print.printer_WebEx_Document_Loader.print_footercenter: print.printer_WebEx_Document_Loader.print_footerleft: &PT print.printer_WebEx_Document_Loader.print_footerright: &D print.printer_WebEx_Document_Loader.print_headercenter: print.printer_WebEx_Document_Loader.print_headerleft: &T print.printer_WebEx_Document_Loader.print_headerright: &U print.printer_WebEx_Document_Loader.print_in_color: true print.printer_WebEx_Document_Loader.print_margin_bottom: 0.5 print.printer_WebEx_Document_Loader.print_margin_left: 0.5 print.printer_WebEx_Document_Loader.print_margin_right: 0.5 print.printer_WebEx_Document_Loader.print_margin_top: 0.5 print.printer_WebEx_Document_Loader.print_oddpages: true print.printer_WebEx_Document_Loader.print_orientation: 0 print.printer_WebEx_Document_Loader.print_page_delay: 50 print.printer_WebEx_Document_Loader.print_paper_data: 9 print.printer_WebEx_Document_Loader.print_paper_height: 11.00 print.printer_WebEx_Document_Loader.print_paper_name: print.printer_WebEx_Document_Loader.print_paper_size_type: 0 print.printer_WebEx_Document_Loader.print_paper_size_unit: 1 print.printer_WebEx_Document_Loader.print_paper_width: 8.50 print.printer_WebEx_Document_Loader.print_resolution: -437918235 print.printer_WebEx_Document_Loader.print_reversed: false print.printer_WebEx_Document_Loader.print_scaling: 1.00 print.printer_WebEx_Document_Loader.print_shrink_to_fit: true print.printer_WebEx_Document_Loader.print_to_file: false print.printer_WebEx_Document_Loader.print_unwriteable_margin_bottom: 0 print.printer_WebEx_Document_Loader.print_unwriteable_margin_left: 0 print.printer_WebEx_Document_Loader.print_unwriteable_margin_right: 0 print.printer_WebEx_Document_Loader.print_unwriteable_margin_top: 0 privacy.sanitize.migrateClearSavedPwdsOnExit: true privacy.sanitize.migrateFx3Prefs: true privacy.trackingprotection.pbmode.enabled: false security.disable_button.openCertManager: false security.disable_button.openDeviceManager: false services.sync.declinedEngines: services.sync.engine.prefs.modified: false services.sync.lastPing: 1463437306 services.sync.lastSync: Mon May 16 2016 23:22:15 GMT+0100 (GMT Standard Time) services.sync.numClients: 5 storage.vacuum.last.index: 1 storage.vacuum.last.places.sqlite: 1461856828 ui.osk.debug.keyboardDisplayReason: IKPOS: Rotation sensor not found.

Important Locked Preferences

JavaScript

Incremental GC: true

Accessibility

Activated: true Prevent Accessibility: 0

Library Versions

NSPR Expected minimum version: 4.12 Version in use: 4.12

NSS Expected minimum version: 3.22.3 Basic ECC Version in use: 3.22.3 Basic ECC

NSSSMIME Expected minimum version: 3.22.3 Basic ECC Version in use: 3.22.3 Basic ECC

NSSSSL Expected minimum version: 3.22.3 Basic ECC Version in use: 3.22.3 Basic ECC

NSSUTIL Expected minimum version: 3.22.3 Version in use: 3.22.3

Experimental Features

bp-afd23713-5b72-45a5-ad05-1abf62160516

Signature: NsiWorkerThread ++++++++++++++++++++++++++++++++++++++ bp-4f6db8cb-5ec1-4c28-a590-5db622160516

Signature: BaseThreadInitThunk

This is for Sumo's Related Bugs 802825 NEW --- crash in nsFilePicker::ShowFilePicker / BaseThreadInitThunk working with attachments [windows vista]

601587 NEW --- Firefox 4.0b6 crash on Windows Vista/7 [@ BaseThreadInitThunk ] +++++++++++++++++++++++++++++++++++++++++++++++ bp-c3574bda-89bc-47cf-9c8a-3a5712160516 bp-b1fbf83d-42dc-46d0-85a0-766fc2160516 bp-4dec0d3a-aba6-4ca9-9aef-1503d2160514

Signature: BaseThreadInitThunk

This is for Sumo's Related Bugs 802825 NEW --- crash in nsFilePicker::ShowFilePicker / BaseThreadInitThunk working with attachments [windows vista]

601587 NEW --- Firefox 4.0b6 crash on Windows Vista/7 [@ BaseThreadInitThunk ]

Use this link to check that your plugins are up-to-date. If any are listed as unknown or research, do not worry about them.

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?

I've called the big guys to help you. Good luck.

This morning, Firefox prompted a dialog to say that there were known issues with Apple iCloud Bookmark sync and disabled/blocked (https://blocklist.addons.mozilla.org/en-GB/firefox/blocked/i1214). After reopening Firefox it seemed to quit again (when I wasn't watching) and had a dialog for sending a crash report. This might have been simply a dialog following the initial iCloud plugin and not actually a second crash.

I now have Firefox open and it's fine for the last few minutes (I'm typing this in Firefox).

The Plugin check only listed Quicktime as needing an update but Apple suggested just removing it as it is no longer required by modern Windows browsers so I've uninstalled quicktime and it's no longer listed in Plugin check. So Java, Flash and Silverlight are up to date - all others are unknown.

If it crashes again, I'll revert to safe mode but I guess iCloud Bookmarks was the culprit.

Many thanks for the guidance.

Hasn't crashed all day, Assuming all resolved. Good work!

Good to hear. Safe surfing.