hello, could you go to the

• firefox menu > help > troubleshooting information,

copy the contents of that page and paste them here into a reply on the forum? this might give us a clue what is going on...

Reply as requested. Thanks.

Application Basics

Name: Firefox Version: 31.0 User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0

Crash Reports for the Last 3 Days

All Crash Reports

Extensions

Name: Adblock Plus Version: 2.6.4 Enabled: true ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}

Name: Get Mail Plus Version: 3.4.10 Enabled: true ID: [email protected]

Name: Ghostery Version: 5.3.2 Enabled: true ID: [email protected]

Name: Karma Blocker Version: 0.4.8 Enabled: true ID: [email protected]

Name: Linkification Version: 1.3.8 Enabled: true ID: {35106bca-6c78-48c7-ac28-56df30b51d2a}

Graphics

Adapter Description: NVIDIA GeForce GTS 450 Adapter Drivers: nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um Adapter RAM: 1024 Device ID: 0x0dc4 Direct2D Enabled: true DirectWrite Enabled: true (6.2.9200.16571) Driver Date: 5-19-2014 Driver Version: 9.18.13.3788 GPU #2 Active: false GPU Accelerated Windows: 1/1 Direct3D 10 Vendor ID: 0x10de WebGL Renderer: Google Inc. -- ANGLE (NVIDIA GeForce GTS 450 Direct3D9Ex vs_3_0 ps_3_0) windowLayerManagerRemote: false AzureCanvasBackend: direct2d AzureContentBackend: direct2d AzureFallbackCanvasBackend: cairo AzureSkiaAccelerated: 0

Important Modified Preferences

browser.cache.disk.capacity: 358400 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 browser.cache.memory.enable: false browser.cache.offline.capacity: 0 browser.cache.offline.enable: false browser.display.use_document_fonts: 0 browser.newtab.url: https://www.google.co.uk/ browser.places.smartBookmarksVersion: 7 browser.search.update: false browser.sessionstore.upgradeBackup.latestBuildID: 20140716183446 browser.startup.homepage: https://www.google.co.uk/ browser.startup.homepage_override.buildID: 20140716183446 browser.startup.homepage_override.mstone: 31.0 dom.mozApps.used: true dom.storage.enabled: false extensions.lastAppVersion: 31.0 font.internaluseonly.changed: true gfx.direct3d.last_used_feature_level_idx: 0 network.cookie.prefsMigrated: true network.dns.disableIPv6: true network.dnsCacheEntries: 20 network.http.connect.timeout: 30 network.http.keep-alive: true network.http.keep-alive.timeout: 300 network.http.max-connections-per-server: 15 network.http.max-persistent-connections-per-proxy: 8 network.http.pipelining.maxrequests: 4 network.http.proxy.keep-alive: true network.http.proxy.pipelining: true places.database.lastMaintenance: 1408579435 places.history.expiration.transient_current_max_pages: 104858 plugin.disable_full_page_plugin_for_types: application/pdf plugin.importedState: true print.printer_EPSON_SX210_Series.print_bgcolor: false print.printer_EPSON_SX210_Series.print_bgimages: false print.printer_EPSON_SX210_Series.print_colorspace: print.printer_EPSON_SX210_Series.print_command: print.printer_EPSON_SX210_Series.print_downloadfonts: false print.printer_EPSON_SX210_Series.print_duplex: 1515870810 print.printer_EPSON_SX210_Series.print_edge_bottom: 0 print.printer_EPSON_SX210_Series.print_edge_left: 0 print.printer_EPSON_SX210_Series.print_edge_right: 0 print.printer_EPSON_SX210_Series.print_edge_top: 0 print.printer_EPSON_SX210_Series.print_evenpages: true print.printer_EPSON_SX210_Series.print_footercenter: print.printer_EPSON_SX210_Series.print_footerleft: &PT print.printer_EPSON_SX210_Series.print_footerright: &D print.printer_EPSON_SX210_Series.print_headercenter: print.printer_EPSON_SX210_Series.print_headerleft: &T print.printer_EPSON_SX210_Series.print_headerright: &U print.printer_EPSON_SX210_Series.print_in_color: true print.printer_EPSON_SX210_Series.print_margin_bottom: 0.5 print.printer_EPSON_SX210_Series.print_margin_left: 0.5 print.printer_EPSON_SX210_Series.print_margin_right: 0.5 print.printer_EPSON_SX210_Series.print_margin_top: 0.5 print.printer_EPSON_SX210_Series.print_oddpages: true print.printer_EPSON_SX210_Series.print_orientation: 0 print.printer_EPSON_SX210_Series.print_page_delay: 50 print.printer_EPSON_SX210_Series.print_paper_data: 9 print.printer_EPSON_SX210_Series.print_paper_height: 11.00 print.printer_EPSON_SX210_Series.print_paper_name: print.printer_EPSON_SX210_Series.print_paper_size_type: 0 print.printer_EPSON_SX210_Series.print_paper_size_unit: 1 print.printer_EPSON_SX210_Series.print_paper_width: 8.50 print.printer_EPSON_SX210_Series.print_plex_name: print.printer_EPSON_SX210_Series.print_resolution: 1515870810 print.printer_EPSON_SX210_Series.print_resolution_name: print.printer_EPSON_SX210_Series.print_reversed: false print.printer_EPSON_SX210_Series.print_scaling: 1.00 print.printer_EPSON_SX210_Series.print_shrink_to_fit: true print.printer_EPSON_SX210_Series.print_to_file: false print.printer_EPSON_SX210_Series.print_unwriteable_margin_bottom: 0 print.printer_EPSON_SX210_Series.print_unwriteable_margin_left: 0 print.printer_EPSON_SX210_Series.print_unwriteable_margin_right: 0 print.printer_EPSON_SX210_Series.print_unwriteable_margin_top: 0 privacy.sanitize.migrateFx3Prefs: true storage.vacuum.last.index: 1 storage.vacuum.last.places.sqlite: 1406806895

JavaScript

Incremental GC: true

Accessibility

Activated: false Prevent Accessibility: 0

Library Versions

NSPR Expected minimum version: 4.10.6 Version in use: 4.10.6

NSS Expected minimum version: 3.16.2 Basic ECC Version in use: 3.16.2 Basic ECC

NSSSMIME Expected minimum version: 3.16.2 Basic ECC Version in use: 3.16.2 Basic ECC

NSSSSL Expected minimum version: 3.16.2 Basic ECC Version in use: 3.16.2 Basic ECC

NSSUTIL Expected minimum version: 3.16.2 Version in use: 3.16.2

Experimental Features

ok thanks, does this happen on every website or only on one particular? can you also try to replicate this behaviour when you launch firefox in safe mode once? if not, maybe an addon is interfering here...

Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

Hi. It happens on every site I've tried, and also in safe mode. If I hover the mouse over the back button a box pops up saying "Go back one page" even if I have clicked links for 4 or 5 different pages

sorry but this is an issue i've never encountered so far, so i'd need to continue with generic troubleshooting advice: does the problem also occur when you create a new profile for testing purposes?

Profile Manager - Create, remove or switch Firefox profiles

Yes, it still does it with a new profile.

Boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.

• http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/

Did you change all those prefs that show in the System Details list as modified yourself or did you had an extension in the paste that has changed those?

Does this pref still have the default value (50) on the about:config page?

• browser.sessionhistory.max_entries

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config

Fixed now. Thanks very much. The browser.sessionhistory.max_entries was set to 2. Changing it back to 50 fixed the problem.