Type about:preferences#advanced<Enter> in the address bar.

Under Advanced, Select General. Look for and turn off Use Hardware Acceleration.

Then restart the browser. Are there any problems?

If you use extensions (Firefox menu button/Tools > Add-ons > Extensions) that can block content (e.g. Adblock Plus, NoScript, Flash Block, Ghostery) then make sure that such extensions aren't blocking content.

If it works in Safe Mode and in normal mode with all extensions (Firefox menu button/Tools > Add-ons > Extensions) disabled then try to find which extension is causing it by enabling one extension at a time until the problem reappears.

Close and restart Firefox after each change via *"3-bar" menu button > Exit (Power button)

• Windows: File > Exit
• Mac: Firefox > Quit Firefox
• Linux: File > Quit

FredMcD said

Type about:preferences#advanced<Enter> in the address bar. Under Advanced, Select General. Look for and turn off Use Hardware Acceleration. Then restart the browser. Are there any problems?

In my post, I mentioned "turning Hardware Acceleration off does not solve the problem".

cor-el said

If it works in Safe Mode and in normal mode with all extensions (Firefox menu button/Tools > Add-ons > Extensions) disabled ...

Sorry if I wasn't more clear, but if I disable all extensions, I still have the problem. The problem only goes away if I start in Safe Mode. So there is something more subtle here that I don't understand. A plug-in, maybe? How to selectively disable these?

Are you using the default theme?

FredMcD said

Are you using the default theme?

Yes, I am using the Default Theme. (Sorry for using the term "Standard Theme".)

You can try to disable hardware acceleration in Firefox.

• Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"

You need to close and restart Firefox after toggling this setting.

• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

You can check if there is an update for your graphics display driver and check for hardware acceleration related issues.

• https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration

As mentioned, I did try disabling hardware acceleration in Firefox. It did not solve the issue. Only Safe Mode has solved the issue so far.

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.

I deleted the printer preferences so that it all fits here:

Application Basics Name Firefox Version 43.0.2 Build ID 20151221130713 Update History Show Update History Update Channel release User Agent Mozilla/5.0 (Windows NT 6.1; WOW64; rv:43.0) Gecko/20100101 Firefox/43.0 Profile Folder Show Folder Enabled Plugins about:plugins

Build Configuration about:buildconfig

Memory Use about:memory

Registered Service Workers about:serviceworkers

Multiprocess Windows 0/1 (default: false) Safe Mode false Crash Reports for the Last 3 Days Report ID Submitted All Crash Reports This application has not been configured to display crash reports. Extensions Name Version Enabled ID Adblock Plus 2.7 true {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d} Adblock Plus Pop-up Addon 0.9.2.1-signed true [email protected] Autofill Forms 1.0.6.1-signed true [email protected] Dashlane 3.6.0 true [email protected] DownThemAll! 2.0.18.1-signed.1-let-fixed true {DDC359D1-844A-42a7-9AA1-88A850A938A8} DownThemAll! AntiContainer 1.4 true [email protected] Forecastfox (fix version) 2.3.5 true forecastfox@s3_fix_version Print Friendly & PDF 2.0.2 true jid0-YQz0l1jthOIz179ehuitYAOdBEs@jetpack Restart Button 0.1.5.1-signed true [email protected] Saved Password Editor 2.9.4 true [email protected] The Addon Bar (restored) 3.2.1-signed true the-addon-bar@GeekInTraining-GiT Update Scanner 3.2.3 true {c07d1a49-9894-49ff-a594-38960ede8fb9} WOT 20151208 true {a0d7ccb3-214d-498b-b4aa-0e8fda9a7bf7} Trend Micro NSC Firefox Extension 5.82.0.1081 false {22C7F6C6-8D67-4534-92B5-529A0EC09405} Graphics Adapter Description Intel(R) HD Graphics Adapter Drivers igdumd64 igd10umd64 igdumdx32 igd10umd32 Adapter RAM Unknown Asynchronous Pan/Zoom none Device ID 0x0046 Direct2D Enabled true DirectWrite Enabled true (6.1.7601.19061) Driver Date 6-10-2011 Driver Version 8.15.10.2418 GPU #2 Active false GPU Accelerated Windows 1/1 Direct3D 11 (OMTC) Subsys ID 04291028 Supports Hardware H264 Decoding Yes Vendor ID 0x8086 WebGL Renderer Google Inc. -- ANGLE (Intel(R) HD Graphics Direct3D9Ex vs_3_0 ps_3_0) windowLayerManagerRemote true AzureCanvasBackend direct2d AzureContentBackend direct2d AzureFallbackCanvasBackend cairo AzureSkiaAccelerated 0 Important Modified Preferences Name Value accessibility.typeaheadfind true 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 3 browser.download.importedFromSqlite true browser.download.manager.closeWhenDone true browser.download.useDownloadDir false browser.places.smartBookmarksVersion 7 browser.search.suggest.enabled false browser.sessionstore.upgradeBackup.latestBuildID 20151221130713 browser.startup.homepage about:blank browser.startup.homepage_override.buildID 20151221130713 browser.startup.homepage_override.mstone 43.0.2 dom.apps.reset-permissions true dom.max_script_run_time 0 dom.mozApps.used true dom.w3c_touch_events.expose false extensions.lastAppVersion 43.0.2 font.internaluseonly.changed true gfx.crash-guard.d3d11layers.appVersion 43.0.2 gfx.crash-guard.d3d11layers.deviceID 0x0046 gfx.crash-guard.d3d11layers.driverVersion 8.15.10.2418 gfx.crash-guard.d3d11layers.feature-d2d true gfx.crash-guard.d3d11layers.feature-d3d11 true gfx.crash-guard.glcontext.appVersion 43.0.2 gfx.crash-guard.glcontext.deviceID 0x0046 gfx.crash-guard.glcontext.driverVersion 8.15.10.2418 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.checkDX10 false gfx.direct3d.last_used_feature_level_idx 1 gfx.driver-init.appVersion 42.0 gfx.driver-init.deviceID 0x0046 gfx.driver-init.driverVersion 8.15.10.2418 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 1447081277 media.gmp-eme-adobe.version 15 media.gmp-gmpopenh264.abi x86-msvc media.gmp-gmpopenh264.lastUpdate 1451504408 media.gmp-gmpopenh264.version 1.5.3 media.gmp-manager.buildID 20151221130713 media.gmp-manager.lastCheck 1452094906 media.hardware-video-decoding.failed false network.cookie.cookieBehavior 1 network.cookie.prefsMigrated true network.predictor.cleaned-up true places.database.lastMaintenance 1451959247 places.history.expiration.transient_current_max_pages 104858 plugin.disable_full_page_plugin_for_types application/pdf plugin.importedState true plugin.state.npmozcouponprinter 1 privacy.donottrackheader.enabled true privacy.sanitize.migrateFx3Prefs true storage.vacuum.last.index 1 storage.vacuum.last.places.sqlite 1449967014 user.js Preferences Your profile folder contains a user.js file, which includes preferences that were not created by Firefox. Important Locked Preferences Name Value JavaScript Incremental GC true Accessibility Activated false Prevent Accessibility 0 Library Versions Expected minimum version Version in use NSPR 4.10.10 4.10.10 NSS 3.20.2 Basic ECC 3.20.2 Basic ECC NSSSMIME 3.20.2 Basic ECC 3.20.2 Basic ECC NSSSSL 3.20.2 Basic ECC 3.20.2 Basic ECC NSSUTIL 3.20.2 3.20.2 Experimental Features Name ID Description Active End Date Homepage

civic-mindedness said

All Crash Reports This application has not been configured to display crash reports.

You must turn on Enable Crash Reports. Type about:preferences#advanced<enter> in the address bar. Select Data Choices.

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

Rename the user.js file by adding .old to it.. Type about:support in the address bar and press enter.

Under the page logo on the left side you will see Application Basics. Under this find Profile Folder. To it’s right press the button Show Folder. This will open your file browser to the current Firefox profile. Now Close Firefox.

Locate the file. Then rename or delete it. Restart Firefox.

FredMcD said

civic-mindedness said

All Crash Reports This application has not been configured to display crash reports.

You must turn on Enable Crash Reports. Type about:preferences#advanced<enter> in the address bar. Select Data Choices.

How are Crash Reports relevant to this issue? Firefox isn't crashing.

If it does crash, this will leave a record that we can check out. Did you take care of the user.js file?

FredMcD said

If it does crash, this will leave a record that we can check out. Did you take care of the user.js file?

There is no user.js file. Instead, there is a prefs.js file which I am reluctant to rename as my preferences are synchronized across multiple devices. Thanks for the help, but I prefer a different route if possible.

I've called the big guys to help you. Good luck.

After several months and different versions of Firefox, I just noticed that I do not have this problem now, using Firefox 44.0.2. I'm using the same add-ons (and added Firebug). I hope this lasts! Thanks for the help (I'm not sure that "the big guys" helped out, though).

That's good to hear. Please flag your last post as Solved Problem so others will know.