hello, you are probably lacking a right graphics driver for your system. 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... thank you

Application Basics

Name: Firefox Version: 38.0.1 Build ID: 20150513174244 Update Channel: release User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0 Multiprocess Windows: 0/1 (default: false)

Crash Reports for the Last 3 Days

All Crash Reports

Extensions

Name: Adobe Acrobat - Create PDF Version: 1.2 Enabled: false ID: web2pdfextension@web2pdf.adobedotcom

Name: Avast Online Security Version: 10.2.0.187 Enabled: false ID: wrc@avast.com

Graphics

Adapter Description: Standard VGA Graphics Adapter Adapter Drivers: vga framebuf vga256 vga64k Adapter RAM: Unknown Device ID: 0x68f9 Direct2D Enabled: Blocked for your graphics driver version. Try updating your graphics driver to version 9.6 or newer. DirectWrite Enabled: false (6.2.9200.17292) Driver Date: 6-21-2006 Driver Version: 6.1.7600.16385 GPU #2 Active: false GPU Accelerated Windows: 1/1 Direct3D 11 WARP (OMTC) Subsys ID: 30301682 Vendor ID: 0x1002 WebGL Renderer: Blocked for your graphics driver version. Try updating your graphics driver to version 9.6 or newer. windowLayerManagerRemote: true AzureCanvasBackend: skia AzureContentBackend: cairo AzureFallbackCanvasBackend: cairo AzureSkiaAccelerated: 0

Important Modified Preferences

browser.cache.disk.capacity: 358400 browser.cache.disk.smart_size.first_run: false browser.cache.frecency_experiment: 2 browser.download.importedFromSqlite: true browser.places.smartBookmarksVersion: 7 browser.sessionstore.upgradeBackup.latestBuildID: 20150513174244 browser.startup.homepage_override.buildID: 20150513174244 browser.startup.homepage_override.mstone: 38.0.1 extensions.lastAppVersion: 38.0.1 media.gmp-eme-adobe.lastUpdate: 1432043935 media.gmp-eme-adobe.version: 9 media.gmp-gmpopenh264.lastUpdate: 1432043937 media.gmp-gmpopenh264.version: 1.4 media.gmp-manager.buildID: 20150513174244 media.gmp-manager.lastCheck: 1432132670 network.cookie.prefsMigrated: true network.predictor.cleaned-up: true places.database.lastMaintenance: 1432132694 places.history.expiration.transient_current_max_pages: 104858 plugin.disable_full_page_plugin_for_types: application/pdf plugin.importedState: true privacy.sanitize.migrateFx3Prefs: true

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: 3.18.1 Basic ECC Version in use: 3.18.1 Basic ECC

NSSSMIME Expected minimum version: 3.18.1 Basic ECC Version in use: 3.18.1 Basic ECC

NSSSSL Expected minimum version: 3.18.1 Basic ECC Version in use: 3.18.1 Basic ECC

NSSUTIL Expected minimum version: 3.18.1 Version in use: 3.18.1

Experimental Features

hi again barbara, thanks for following up with this information. it seems that your system is lacking a graphics driver, which unfortunately causes this bug you're experiencing in firefox. please install this driver from ati/amd which should match your configuration and get you back to the speed you're used to: http://support.amd.com/en-us/download/desktop?os=Windows%207%20-%2064

Firefox is working just fine now. Thanks for your help with this. I wish I understood it. But I suppose the most important thing is that it works. Thanks again! Barbara