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My tabs close unrequested.

  • 10 uphendule
  • 1 inale nkinga
  • Igcine ukuphendulwa ngu cor-el

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I have a problem where my tabs sometimes abruptly, seemingly randomly, close. I couldn't find anything about this specific problem. I don't know if it's the computer thinking I'm moving the mouse in a way that simulates a touchscreen command to close the tab, but in any event I don't have a touchscreen and don't want my tabs closing without my specifically clicking on the X to close them. Does anyone know what could cause this and what I can do about it?

All Replies (10)

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Does only the currently selected tab close or does Firefox close as well?

Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

  • Switch to the DEFAULT theme: "3-bar" menu button or Tools > Add-ons > Appearance
  • Do NOT click the "Refresh Firefox" button on the Safe Mode start window
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Separate Issue; Your System Details shows;

Installed Plug-ins

Shockwave Flash 20.0 r0 Shockwave Flash 21.0 r0
Having more than one version of a program may cause issues. You must remove the older programs. Then get the current full installer.

Flash: Grab the uninstaller from here: Uninstall Flash Player | Windows Uninstall Flash Player | Mac

Then reinstall the latest version.

Note: Windows users should download the active_x for Internet Explorer. and the plugin for Plugin-based browsers (like Firefox).

Note: Windows 8 and Windows 10 have built-in flash players and Adobe will cause a conflict. Install the plugin only. Not the active_x.

Flash Player Version: Flash Player (Linux) Version Direct link scans current system and browser Note: Other software is offered in the download. Step 1: Select Operating System Step 2: Select A Version (Firefox, Win IE . . . .) Note: Other software is offered in the download.

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cor-el said

Does only the currently selected tab close or does Firefox close as well?

Neither, actually. It's always a tab I don't have selected at the time.

Safe mode doesn't find anything; I'm trying fixing my Flash installation. Thanks.

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What was in that tab, or does it happen with anything?

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FredMcD said

What was in that tab, or does it happen with anything?

It happens with any tab, completely at random--it always happens when I'm doing something though, I don't go away from my keyboard and come back to fewer tabs than before I stood up. It really seems like the browser is parsing my finger movements on the keyboard or my mouse movements to translate to hitting the X to close a tab.

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What I mean was; is it the same web page that disappears? Can you tell how long that tab was open before it disappears?

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.

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FredMcD said

What I mean was; is it the same web page that disappears? Can you tell how long that tab was open before it disappears?

Right, I understood the question. No, it can happen to any webpage I go to. Time seems to be random, sometimes minutes, sometimes hours.

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

All Crash Reports (including 1 pending crash in the given time range)


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

Name: Firefox Hello Beta Version: 1.3.2 Enabled: true ID:

Name: FoxReplace Version: Enabled: true ID: fox@replace.fx

Name: killfile Version: 0.2.9 Enabled: true ID:

Name: Multi-process staged rollout Version: 1.0 Enabled: true ID:

Name: Pocket Version: 1.0 Enabled: true ID:

Name: Avast Online Security Version: Enabled: false ID:

Name: Avast SafePrice Version: Enabled: false ID:

Name: McAfee Security Scan Plus Version: 1.0 Enabled: false ID: {e4f94d1e-2f53-401e-8885-681602c0ddd8}


Adapter Description: AMD Radeon HD 5670 Adapter Drivers: aticfx64 aticfx64 aticfx64 amdxc64 aticfx32 aticfx32 aticfx32 amdxc32 atiumd64 atidxx64 atidxx64 atiumdag atidxx32 atidxx32 atiumdva atiumd6a atitmm64 Adapter RAM: 512 Asynchronous Pan/Zoom: none Device ID: 0x68d8 Direct2D Enabled: true DirectWrite Enabled: true (10.0.10586.0) Driver Date: 11-4-2015 Driver Version: 15.201.1151.1008 GPU #2 Active: false GPU Accelerated Windows: 1/1 Direct3D 11 (OMTC) Subsys ID: 30601682 Supports Hardware H264 Decoding: Yes Vendor ID: 0x1002 WebGL Renderer: Google Inc. -- ANGLE (AMD Radeon HD 5670 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.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_cached_value: 358400 browser.cache.disk.smart_size.first_run: false browser.cache.disk.smart_size.use_old_max: false browser.cache.frecency_experiment: 1 true false browser.places.smartBookmarksVersion: 7 false true browser.sessionstore.upgradeBackup.latestBuildID: 20160502172042 browser.startup.homepage: browser.startup.homepage_override.buildID: 20160502172042 browser.startup.homepage_override.mstone: 46.0.1 browser.tabs.warnOnClose: false browser.urlbar.autoFill: false browser.urlbar.autoFill.typed: false browser.urlbar.default.behavior: 1 browser.urlbar.suggest.bookmark: false browser.urlbar.suggest.openpage: false dom.apps.reset-permissions: true dom.mozApps.used: true dom.w3c_touch_events.expose: false extensions.lastAppVersion: 46.0.1 font.internaluseonly.changed: false gfx.crash-guard.d3d11layers.appVersion: 46.0.1 gfx.crash-guard.d3d11layers.deviceID: 0x68d8 gfx.crash-guard.d3d11layers.driverVersion: 15.201.1151.1008 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.direct3d.prefer_10_1: true gfx.driver-init.appVersion: 42.0 gfx.driver-init.deviceID: 0x68d8 gfx.driver-init.driverVersion: 15.201.1151.0 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: 1462538785 media.gmp-eme-adobe.version: 17 media.gmp-gmpopenh264.abi: x86-msvc-x64 media.gmp-gmpopenh264.lastUpdate: 1455291148 media.gmp-gmpopenh264.version: 1.5.3 media.gmp-manager.buildID: 20160502172042 media.gmp-manager.lastCheck: 1465068379 media.hardware-video-decoding.failed: false media.webrtc.debug.aec_log_dir: C:\Users\Kish\AppData\Local\Temp media.webrtc.debug.log_file: C:\Users\Kish\AppData\Local\Temp\WebRTC.log 43 network.auth.allow-subresource-auth: 2 network.cookie.prefsMigrated: true network.predictor.cleaned-up: true network.protocol-handler.warn-external.dnupdate: false places.database.lastMaintenance: 1464893864 places.history.expiration.transient_current_max_pages: 104858 plugin.disable_full_page_plugin_for_types: application/pdf plugin.importedState: true print.printer_HP_Deskjet_1000_J110_series.print_bgcolor: false print.printer_HP_Deskjet_1000_J110_series.print_bgimages: false print.printer_HP_Deskjet_1000_J110_series.print_colorspace: print.printer_HP_Deskjet_1000_J110_series.print_command: print.printer_HP_Deskjet_1000_J110_series.print_downloadfonts: false print.printer_HP_Deskjet_1000_J110_series.print_duplex: -886112878 print.printer_HP_Deskjet_1000_J110_series.print_edge_bottom: 0 print.printer_HP_Deskjet_1000_J110_series.print_edge_left: 0 print.printer_HP_Deskjet_1000_J110_series.print_edge_right: 0 print.printer_HP_Deskjet_1000_J110_series.print_edge_top: 0 print.printer_HP_Deskjet_1000_J110_series.print_evenpages: true print.printer_HP_Deskjet_1000_J110_series.print_footercenter: print.printer_HP_Deskjet_1000_J110_series.print_footerleft: &PT print.printer_HP_Deskjet_1000_J110_series.print_footerright: &D print.printer_HP_Deskjet_1000_J110_series.print_headercenter: print.printer_HP_Deskjet_1000_J110_series.print_headerleft: &T print.printer_HP_Deskjet_1000_J110_series.print_headerright: &U print.printer_HP_Deskjet_1000_J110_series.print_in_color: true print.printer_HP_Deskjet_1000_J110_series.print_margin_bottom: 0.5 print.printer_HP_Deskjet_1000_J110_series.print_margin_left: 0.5 print.printer_HP_Deskjet_1000_J110_series.print_margin_right: 0.5 print.printer_HP_Deskjet_1000_J110_series.print_margin_top: 0.5 print.printer_HP_Deskjet_1000_J110_series.print_oddpages: true print.printer_HP_Deskjet_1000_J110_series.print_orientation: 0 print.printer_HP_Deskjet_1000_J110_series.print_page_delay: 50 print.printer_HP_Deskjet_1000_J110_series.print_paper_data: 1 print.printer_HP_Deskjet_1000_J110_series.print_paper_height: 11.00 print.printer_HP_Deskjet_1000_J110_series.print_paper_name: print.printer_HP_Deskjet_1000_J110_series.print_paper_size_type: 0 print.printer_HP_Deskjet_1000_J110_series.print_paper_size_unit: 0 print.printer_HP_Deskjet_1000_J110_series.print_paper_width: 8.50 print.printer_HP_Deskjet_1000_J110_series.print_plex_name: print.printer_HP_Deskjet_1000_J110_series.print_resolution: 0 print.printer_HP_Deskjet_1000_J110_series.print_resolution_name: print.printer_HP_Deskjet_1000_J110_series.print_reversed: false print.printer_HP_Deskjet_1000_J110_series.print_scaling: 1.00 print.printer_HP_Deskjet_1000_J110_series.print_shrink_to_fit: true print.printer_HP_Deskjet_1000_J110_series.print_to_file: false print.printer_HP_Deskjet_1000_J110_series.print_unwriteable_margin_bottom: 0 print.printer_HP_Deskjet_1000_J110_series.print_unwriteable_margin_left: 0 print.printer_HP_Deskjet_1000_J110_series.print_unwriteable_margin_right: 0 print.printer_HP_Deskjet_1000_J110_series.print_unwriteable_margin_top: 0 privacy.sanitize.migrateClearSavedPwdsOnExit: true privacy.sanitize.migrateFx3Prefs: true privacy.sanitize.timeSpan: 0 security.warn_viewing_mixed: false storage.vacuum.last.index: 1 storage.vacuum.last.places.sqlite: 1463933205 ui.osk.debug.keyboardDisplayReason: IKPOS: Touch screen not found.

user.js Preferences

Your profile folder contains a user.js file, which includes preferences that were not created by Firefox.

Important Locked Preferences


Incremental GC: true


Activated: false 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

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You probably are familiar with "Undo Close Tab" on the right-click menu of another tab (or Ctrl+Shift+t), so you could recover these tabs when you see them closing. But if you don't see it, you might miss it...

This is an odd problem because there isn't a keyboard shortcut to close a random inactive tab, and if you aren't moving the mouse pointer over a tab, then neither a direct click on the X or a middle-click (scroll wheel click) should be perceived as hitting the tab.

Sometimes a site will launch a new tab using a specific name (rather than just "blank new tab"). This enables the "parent" page to retain more control over the "child" page and potentially close it at some point. But I'm not sure why it would. Pages opened by a script also can close themselves, but that seldom occurs at random.

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Some of your crash reports weren’t sent to the Mozilla Servers.

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.

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Note that the Troubleshooting information shows that you have a user.js file.

user.js Preferences
Your profile folder contains a user.js file, which includes preferences that were not created by Firefox.

The user.js file will only be present if you or other software has created this file and normally won't be present.

You can check its content with a plain text editor (right-click: "Open with"; do not double-click). The user.js file is read each time Firefox is started and initializes preferences to the value specified in this file, so preferences set via user.js can only be changed temporarily for the current session.

You can delete the user.js file if you didn't create this file yourself.

You can use this button to go to the current Firefox profile folder:

Windows hides some file extensions by default. Among them .html and .ini and .js and .txt and you may only see a file name without file extension. You can check the file extension (type) in the properties of the file in Windows Explorer via the right-click context menu.

Okulungisiwe ngu cor-el