Take a look at Help > About Firefox in your Firefox installation and see what version you have.

Or use Help > Troubleshooting Information and use the Copy text to clipboard button at the top of that tab, then paste that information in the Reply box in this thread.

He (FFX) tells me that he is all up to date, at version 43.0 - I've attached screencaps of two instances of sites telling me it's out of date, along with the About Window.

Thanks for your reply!

Does the UserAgent string in Troubleshooting Information show Firefox 43.0 also? Should look like this - Mozilla/5.0 (Windows NT 6.1; rv:43.0) Gecko/20100101 Firefox/43.0

Here you go! Sorry I forgot this last time:

Application Basics

Name: Firefox Version: 43.0 Build ID: 20151208100201 Update Channel: release User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0.1) Gecko/20151014 Firefox/4.0.0; xs-rTABxpCdhAg;CigyBE; Multiprocess Windows: 0/1 (default: false) Safe Mode: false

Crash Reports for the Last 3 Days

All Crash Reports

Extensions

Graphics

Adapter Description: Intel(R) HD Graphics 4000 Adapter Drivers: igdumd64 igd10umd64 igd10umd64 igdumd32 igd10umd32 igd10umd32 Adapter RAM: Unknown Asynchronous Pan/Zoom: none Device ID: 0x0166 Direct2D Enabled: true DirectWrite Enabled: true (6.2.9200.16492) Driver Date: 2-22-2013 Driver Version: 9.17.10.3040 GPU #2 Active: false GPU Accelerated Windows: 1/1 Direct3D 11 (OMTC) Subsys ID: 05341028 Supports Hardware H264 Decoding: Yes Vendor ID: 0x8086 WebGL Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 4000 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.smart_size.first_run: false browser.cache.disk.smart_size.use_old_max: false browser.cache.frecency_experiment: 4 browser.download.importedFromSqlite: true browser.places.smartBookmarksVersion: 7 browser.sessionstore.upgradeBackup.latestBuildID: 20151208100201 browser.startup.homepage_override.buildID: 20151208100201 browser.startup.homepage_override.mstone: 43.0 browser.tabs.warnOnClose: false dom.apps.reset-permissions: true dom.mozApps.used: true extensions.lastAppVersion: 43.0 font.internaluseonly.changed: false general.useragent.override: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0.1) Gecko/20151014 Firefox/4.0.0; xs-rTABxpCdhAg;CigyBE; gfx.crash-guard.d3d11layers.appVersion: 43.0 gfx.crash-guard.d3d11layers.deviceID: 0x0166 gfx.crash-guard.d3d11layers.driverVersion: 9.17.10.3040 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: 0x0166 gfx.driver-init.driverVersion: 9.17.10.3040 gfx.driver-init.feature-d2d: true gfx.driver-init.feature-d3d11: true gfx.driver-init.status: 2 media.gmp-eme-adobe.abi: x86-msvc media.gmp-eme-adobe.lastUpdate: 1447251829 media.gmp-eme-adobe.version: 15 media.gmp-gmpopenh264.abi: x86-msvc media.gmp-gmpopenh264.lastUpdate: 1447936691 media.gmp-gmpopenh264.version: 1.5.1 media.gmp-manager.buildID: 20151208100201 media.gmp-manager.lastCheck: 1450447428 media.hardware-video-decoding.failed: false network.cookie.prefsMigrated: true network.predictor.cleaned-up: true places.database.lastMaintenance: 1450272029 places.history.expiration.transient_current_max_pages: 104858 plugin.disable_full_page_plugin_for_types: application/pdf plugin.importedState: true print.printer_\\compserv2\Fairbanks.print_bgcolor: false print.printer_\\compserv2\Fairbanks.print_bgimages: false print.printer_\\compserv2\Fairbanks.print_duplex: -437918235 print.printer_\\compserv2\Fairbanks.print_edge_bottom: 0 print.printer_\\compserv2\Fairbanks.print_edge_left: 0 print.printer_\\compserv2\Fairbanks.print_edge_right: 0 print.printer_\\compserv2\Fairbanks.print_edge_top: 0 print.printer_\\compserv2\Fairbanks.print_evenpages: true print.printer_\\compserv2\Fairbanks.print_footercenter: print.printer_\\compserv2\Fairbanks.print_footerleft: &PT print.printer_\\compserv2\Fairbanks.print_footerright: &D print.printer_\\compserv2\Fairbanks.print_headercenter: print.printer_\\compserv2\Fairbanks.print_headerleft: &T print.printer_\\compserv2\Fairbanks.print_headerright: &U print.printer_\\compserv2\Fairbanks.print_in_color: true print.printer_\\compserv2\Fairbanks.print_margin_bottom: 0.5 print.printer_\\compserv2\Fairbanks.print_margin_left: 0.5 print.printer_\\compserv2\Fairbanks.print_margin_right: 0.5 print.printer_\\compserv2\Fairbanks.print_margin_top: 0.5 print.printer_\\compserv2\Fairbanks.print_oddpages: true print.printer_\\compserv2\Fairbanks.print_orientation: 0 print.printer_\\compserv2\Fairbanks.print_page_delay: 50 print.printer_\\compserv2\Fairbanks.print_paper_data: 1 print.printer_\\compserv2\Fairbanks.print_paper_height: 11.00 print.printer_\\compserv2\Fairbanks.print_paper_name: print.printer_\\compserv2\Fairbanks.print_paper_size_type: 0 print.printer_\\compserv2\Fairbanks.print_paper_size_unit: 0 print.printer_\\compserv2\Fairbanks.print_paper_width: 8.50 print.printer_\\compserv2\Fairbanks.print_resolution: -437918235 print.printer_\\compserv2\Fairbanks.print_reversed: false print.printer_\\compserv2\Fairbanks.print_scaling: 1.00 print.printer_\\compserv2\Fairbanks.print_shrink_to_fit: true print.printer_\\compserv2\Fairbanks.print_to_file: false print.printer_\\compserv2\Fairbanks.print_unwriteable_margin_bottom: 0 print.printer_\\compserv2\Fairbanks.print_unwriteable_margin_left: 0 print.printer_\\compserv2\Fairbanks.print_unwriteable_margin_right: 0 print.printer_\\compserv2\Fairbanks.print_unwriteable_margin_top: 0 privacy.sanitize.migrateFx3Prefs: true privacy.sanitize.timeSpan: 4 storage.vacuum.last.index: 1 storage.vacuum.last.places.sqlite: 1449674423

user.js Preferences

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

Important Locked Preferences

JavaScript

Incremental GC: true

Accessibility

Activated: false Prevent Accessibility: 0

Library Versions

NSPR Expected minimum version: 4.10.10 Version in use: 4.10.10

NSS Expected minimum version: 3.20.1 Basic ECC Version in use: 3.20.1 Basic ECC

NSSSMIME Expected minimum version: 3.20.1 Basic ECC Version in use: 3.20.1 Basic ECC

NSSSSL Expected minimum version: 3.20.1 Basic ECC Version in use: 3.20.1 Basic ECC

NSSUTIL Expected minimum version: 3.20.1 Version in use: 3.20.1

Experimental Features

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0.1) Gecko/20151014 Firefox/4.0.0; xs-rTABxpCdhAg;CigyBE;

That's why websites are thinking you are using an old version; either Firefox 2.0 {the rv:2.0.1" or Firefox 4.0 {the Firefox/4.0.0}.

That also shows that you have a user.js file. That is an optional file that some malware has created and used in the past to change the UserAgent, but that type of UserAgent change was blocked from happening via user.js quite awhile ago, like around Firefox 10 or 11, iirc.

The fix is: Go back into Troubleshooting Information and use the Profile Folder - Show Folder button to open your Profile folder. Once the Windows Explorer window opens to your Profile folder you need to close Firefox while leaving the Windows Explorer window open. Then locate that user.js file near the bottom of the window and right-click it and select Delete to delete that file. Then close the Windows Explorer window. When you start Firefox view your Troubleshooting Information again and verify that your UserAgent is fixed and shows Firefox 43.0 at the end of that string.

Thanks so much for all your help!

I found the user.js file and deleted it, then restarted Firefox, but my user agent is still:

Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0.1) Gecko/20151014 Firefox/4.0.0; xs-rTABxpCdhAg;CigyBE;

(

I tried rebooting my machine too, just to be sure, but it still reads the same.

Did you check the content of the user.js file?

Do a malware check with several malware scanning programs on the Windows computer.

• https://support.mozilla.org/kb/troubleshoot-firefox-issues-caused-malware

Please scan with all programs because each program detects different malware. All these programs have free versions.

Make sure that you update each program to get the latest version of their databases before doing a scan.

• Malwarebytes' Anti-Malware:
  http://www.malwarebytes.org/mbam.php
• AdwCleaner:
  http://www.bleepingcomputer.com/download/adwcleaner/
  http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml
• SuperAntispyware:
  http://www.superantispyware.com/
• Microsoft Safety Scanner:
  http://www.microsoft.com/security/scanner/en-us/default.aspx
• Windows Defender:
  http://windows.microsoft.com/en-us/windows/using-defender
• Spybot Search & Destroy:
  http://www.safer-networking.org/en/index.html
• Kasperky Free Security Scan:
  http://www.kaspersky.com/security-scan

You can also do a check for a rootkit infection with TDSSKiller.

• Anti-rootkit utility TDSSKiller:
  http://support.kaspersky.com/5350?el=88446

See also:

• "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

Do a clean reinstall and delete the Firefox program folder before (re)installing a fresh copy of the current Firefox release.

• Download the Firefox installer and save the file to the desktop
  https://www.mozilla.org/en-US/firefox/all/

If possible uninstall your current Firefox version to cleanup the Windows registry and settings in security software.

• Do NOT remove "personal data" when you uninstall your current Firefox version, because this will remove all profile folders and you lose personal data like bookmarks and passwords including data in profiles created by other Firefox versions.

Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.

• (32 bit Windows) "C:\Program Files\Mozilla Firefox\"
• (64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\"

• It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
• http://kb.mozillazine.org/Uninstalling_Firefox

Your personal data like bookmarks is stored in the Firefox profile folder, so you won't lose personal data when you uninstall and (re)install or update Firefox, but make sure NOT to remove personal data when you uninstall Firefox as that will remove all Firefox profile folders and you lose your personal data.

If you keep having problems then create a new profile.

• http://kb.mozillazine.org/Profile_folder_-_Firefox
• http://kb.mozillazine.org/Profile_backup

• http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

The bad useragent string might be stored internally by now (most user.js settings get pulled into your main settings file). This article has steps to try to clear it if that's where it lurks: How to reset the default user agent on Firefox.