hi Susanoz, 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...

To expand my description, it is as if what is typed is partially highlighted and as letters are typed, the cursor moves forward showing partial letters and partial highlighting that appears to be dark.

Ok, here is the cut/paste requested (and thanks):

Application Basics

Name: Firefox Version: 40.0.2 Build ID: 20150812163655 Update Channel: release User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0 Multiprocess Windows: 0/1 (default: false)

Crash Reports for the Last 3 Days

All Crash Reports

Extensions

Name: Adblock Plus Version: 2.6.10 Enabled: true ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}

Name: Tabs on Bottom Version: 0.5.1-signed Enabled: true ID: tabsonbottom@piro.sakura.ne.jp

Graphics

Adapter Description: Intel(R) HD Graphics Family Adapter Drivers: igdumd64 igd10umd64 igd10umd64 igdumdx32 igd10umd32 igd10umd32 Adapter RAM: Unknown Asynchronous Pan/Zoom: none ClearType Parameters: Gamma: 2200 Pixel Structure: R ClearType Level: 100 Enhanced Contrast: 50 Device ID: 0x0116 Direct2D Enabled: true DirectWrite Enabled: true (6.2.9200.17292) Driver Date: 3-25-2011 Driver Version: 8.15.10.2342 GPU #2 Active: false GPU Accelerated Windows: 1/1 Direct3D 11 (OMTC) Subsys ID: 04b01028 Supports Hardware H264 Decoding: true Vendor ID: 0x8086 WebGL Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics Family Direct3D9Ex vs_3_0 ps_3_0) windowLayerManagerRemote: true AzureCanvasBackend: direct2d 1.1 AzureContentBackend: direct2d 1.1 AzureFallbackCanvasBackend: cairo AzureSkiaAccelerated: 0 (#0) Error: OpenSharedResource failed for format 65

Important Modified Preferences

accessibility.typeaheadfind.flashBar: 0 browser.cache.disk.capacity: 358400 browser.cache.disk.filesystem_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: 4 browser.download.folderList: 0 browser.download.importedFromSqlite: true browser.places.smartBookmarksVersion: 7 browser.search.useDBForOrder: true browser.sessionstore.upgradeBackup.latestBuildID: 20150812163655 browser.startup.homepage: http://www.netvibes.com/privatepage/1#US_%26_Christian browser.startup.homepage_override.buildID: 20150812163655 browser.startup.homepage_override.mstone: 40.0.2 browser.tabs.drawInTitlebar: false browser.urlbar.autocomplete.enabled: false browser.urlbar.suggest.bookmark: false browser.urlbar.suggest.history: false browser.urlbar.suggest.openpage: false dom.apps.reset-permissions: true dom.mozApps.used: true extensions.lastAppVersion: 40.0.2 font.internaluseonly.changed: true gfx.direct3d.last_used_feature_level_idx: 0 media.gmp-eme-adobe.lastUpdate: 1437772921 media.gmp-eme-adobe.version: 12 media.gmp-gmpopenh264.lastUpdate: 1432520955 media.gmp-gmpopenh264.version: 1.4 media.gmp-manager.buildID: 20150812163655 media.gmp-manager.lastCheck: 1439502205 network.cookie.prefsMigrated: true network.predictor.cleaned-up: true places.database.lastMaintenance: 1439334896 places.history.enabled: false places.history.expiration.transient_current_max_pages: 104858 plugin.disable_full_page_plugin_for_types: application/pdf plugin.importedState: true plugin.state.nppdf: 2 print.printer_HP_Deskjet_1050_J410_series.print_bgcolor: false print.printer_HP_Deskjet_1050_J410_series.print_bgimages: false print.printer_HP_Deskjet_1050_J410_series.print_colorspace: print.printer_HP_Deskjet_1050_J410_series.print_command: print.printer_HP_Deskjet_1050_J410_series.print_downloadfonts: false print.printer_HP_Deskjet_1050_J410_series.print_duplex: 1515870810 print.printer_HP_Deskjet_1050_J410_series.print_edge_bottom: 0 print.printer_HP_Deskjet_1050_J410_series.print_edge_left: 0 print.printer_HP_Deskjet_1050_J410_series.print_edge_right: 0 print.printer_HP_Deskjet_1050_J410_series.print_edge_top: 0 print.printer_HP_Deskjet_1050_J410_series.print_evenpages: true print.printer_HP_Deskjet_1050_J410_series.print_footercenter: print.printer_HP_Deskjet_1050_J410_series.print_footerleft: &PT print.printer_HP_Deskjet_1050_J410_series.print_footerright: &D print.printer_HP_Deskjet_1050_J410_series.print_headercenter: print.printer_HP_Deskjet_1050_J410_series.print_headerleft: &T print.printer_HP_Deskjet_1050_J410_series.print_headerright: &U print.printer_HP_Deskjet_1050_J410_series.print_in_color: true print.printer_HP_Deskjet_1050_J410_series.print_margin_bottom: 0.300000011920929 print.printer_HP_Deskjet_1050_J410_series.print_margin_left: 0.5 print.printer_HP_Deskjet_1050_J410_series.print_margin_right: 0.5 print.printer_HP_Deskjet_1050_J410_series.print_margin_top: 0.300000011920929 print.printer_HP_Deskjet_1050_J410_series.print_oddpages: true print.printer_HP_Deskjet_1050_J410_series.print_orientation: 0 print.printer_HP_Deskjet_1050_J410_series.print_page_delay: 50 print.printer_HP_Deskjet_1050_J410_series.print_paper_data: 1 print.printer_HP_Deskjet_1050_J410_series.print_paper_height: 11.00 print.printer_HP_Deskjet_1050_J410_series.print_paper_name: print.printer_HP_Deskjet_1050_J410_series.print_paper_size_type: 0 print.printer_HP_Deskjet_1050_J410_series.print_paper_size_unit: 0 print.printer_HP_Deskjet_1050_J410_series.print_paper_width: 8.50 print.printer_HP_Deskjet_1050_J410_series.print_plex_name: print.printer_HP_Deskjet_1050_J410_series.print_resolution: 1515870810 print.printer_HP_Deskjet_1050_J410_series.print_resolution_name: print.printer_HP_Deskjet_1050_J410_series.print_reversed: false print.printer_HP_Deskjet_1050_J410_series.print_scaling: 1.00 print.printer_HP_Deskjet_1050_J410_series.print_shrink_to_fit: true print.printer_HP_Deskjet_1050_J410_series.print_to_file: false print.printer_HP_Deskjet_1050_J410_series.print_unwriteable_margin_bottom: 0 print.printer_HP_Deskjet_1050_J410_series.print_unwriteable_margin_left: 0 print.printer_HP_Deskjet_1050_J410_series.print_unwriteable_margin_right: 0 print.printer_HP_Deskjet_1050_J410_series.print_unwriteable_margin_top: 0 privacy.cpd.cookies: false privacy.cpd.sessions: false privacy.donottrackheader.enabled: true privacy.sanitize.migrateFx3Prefs: true privacy.sanitize.timeSpan: 0 security.disable_button.openCertManager: false storage.vacuum.last.index: 1 storage.vacuum.last.places.sqlite: 1437866717

Important Locked Preferences

JavaScript

Incremental GC: true

Accessibility

Activated: false Prevent Accessibility: 0

Library Versions

NSPR Expected minimum version: 4.10.8 Version in use: 4.10.8

NSS Expected minimum version: 3.19.2 Basic ECC Version in use: 3.19.2 Basic ECC

NSSSMIME Expected minimum version: 3.19.2 Basic ECC Version in use: 3.19.2 Basic ECC

NSSSSL Expected minimum version: 3.19.2 Basic ECC Version in use: 3.19.2 Basic ECC

NSSUTIL Expected minimum version: 3.19.2 Version in use: 3.19.2

Experimental Features

thank you - that's likely an issue with hardware acceleration. please try updating your graphics driver (this should be the right link for your configuration): https://downloadcenter.intel.com/download/24971/Intel-HD-Graphics-Driver-for-Windows-7-8-64-bit

Not sure I know how to do that--time for a trip to my son-in-laws place for assistance. Thanks

just for your info: this issue might "resolve" itself now within the next hours, as mozilla is putting the affected drivers on a blocklist now, so they can no longer cause that problem.

Thank you Phillipp... It is not longer malfunctioning.