This is definitely a Firefox problem. I really to not want to refresh Firefox unless there is no other way to fix this.

Also when the post box disappears the screen grays out and there is an x in the place of the post box . 

Anyone else?

Windows 10 1703

You can try these steps in case of issues with web pages:

You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

• hold down the Shift key and left-click the Reload button
• press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• press "Command + Shift + R" (Mac)

Clear the cache and remove the cookies from websites that cause problems via the "3-bar" Firefox menu button (Options/Preferences).

"Clear the cache":

• Firefox/Options/Preferences -> Advanced -> Network -> Cached Web Content: "Clear Now"

"Remove the cookies" from websites that cause problems.

• Firefox/Options/Preferences -> Privacy -> "Use custom settings for history" -> Cookies: "Show Cookies"

Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.

• switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Appearance
• do NOT click the "Refresh Firefox" button on the Safe Mode start window

• https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

cor-el I tried everything you suggested and it still goes away, even in safe mode. I am really not wanting to refresh because I use logmein and have a client base of about 200 users. If I refresh Auto login will not work and I will have to type usernames and passwords on all those users. When their cookies are gone the Auto login is gone and you have to start over.

Did this work before in Firefox?

If that is the case then when did it stop working?

What security software do you have?

You can remove all data stored in Firefox from a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History -> Show All History" or "View -> Sidebar -> History").

Using "Forget About This Site" will remove all data stored in Firefox from that domain like bookmarks and history and cookies and passwords and cache and exceptions, so be cautious. If you have a password or other data from that domain that you do not want to lose then make sure to backup this data or make a note.

You can't recover from this 'forget' unless you have a backup of involved files.

If you revisit a 'forgotten' website then data from that website will be saved once again.

"Forget site" worked for about 10 minutes. As for security I use Bitdefender, but it was turned off as were all add-in. I have nothing else running that is not running with the other browsers that work just fine. But I prefer Firefox. So what now.

I gave up and just did the refresh and did not sync. Same thing in 10 minutes same problem. I had to go ahead and sync because I have to work. This is after the sync.

Application Basics

Name: Firefox Version: 53.0.2 Build ID: 20170504105526 Update Channel: release User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:53.0) Gecko/20100101 Firefox/53.0 OS: Windows_NT 10.0 Multiprocess Windows: 0/1 (Disabled by add-ons) Safe Mode: false

Crash Reports for the Last 3 Days

All Crash Reports

Extensions

Name: Adblock Plus Version: 2.8.2 Enabled: true ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}

Name: Application Update Service Helper Version: 2.0 Enabled: true ID: [email protected]

Name: Multi-process staged rollout Version: 1.14 Enabled: true ID: [email protected]

Name: Pocket Version: 1.0.5 Enabled: true ID: [email protected]

Name: Shield Recipe Client Version: 1.0.0 Enabled: true ID: [email protected]

Name: TrafficLight Version: 0.2.23.1-signed.1-signed Enabled: true ID: [email protected]

Name: Web Compat Version: 1.0 Enabled: true ID: [email protected]

Graphics

Features Compositing: Direct3D 11 Asynchronous Pan/Zoom: none WebGL Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 520 Direct3D11 vs_5_0 ps_5_0) WebGL2 Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 520 Direct3D11 vs_5_0 ps_5_0) Audio Backend: wasapi Direct2D: true DirectWrite: true (10.0.15063.0) GPU #1 Active: Yes Description: Intel(R) HD Graphics 520 Vendor ID: 0x8086 Device ID: 0x1916 Driver Version: 21.20.16.4590 Driver Date: 1-18-2017 Drivers: igdumdim64 igd10iumd64 igd10iumd64 igd12umd64 igdumdim32 igd10iumd32 igd10iumd32 igd12umd32 Subsys ID: 00000000 RAM: Unknown

Diagnostics AzureCanvasAccelerated: 0 AzureCanvasBackend: direct2d 1.1 AzureContentBackend: direct2d 1.1 AzureFallbackCanvasBackend: skia failures: CP+[GFX1]: Potential driver version mismatch ignored due to missing DLLs 0.0.0.0 and 0.0.0.0 Decision Log D3D9_COMPOSITING: disabled by default: Disabled by default GPU_PROCESS: unavailable by runtime: Multi-process mode is not enabled

Failure Log (#0): CP+[GFX1]: Potential driver version mismatch ignored due to missing DLLs 0.0.0.0 and 0.0.0.0

Important Modified Preferences

browser.cache.disk.capacity: 358400 browser.cache.disk.filesystem_reported: 1 browser.cache.disk.smart_size.first_run: false browser.cache.frecency_experiment: 3 browser.download.importedFromSqlite: true browser.places.smartBookmarksVersion: 8 browser.sessionstore.upgradeBackup.latestBuildID: 20170504105526 browser.startup.homepage: https://www.startpage.com/ browser.startup.homepage_override.buildID: 20170504105526 browser.startup.homepage_override.mstone: 53.0.2 browser.tabs.remote.autostart.2: true browser.tabs.warnOnClose: false browser.urlbar.maxRichResults: 12 browser.urlbar.suggest.searches: true extensions.lastAppVersion: 53.0.2 gfx.crash-guard.d3d11layers.appVersion: 53.0.2 gfx.crash-guard.d3d11layers.deviceID: 0x1916 gfx.crash-guard.d3d11layers.driverVersion: 21.20.16.4590 gfx.crash-guard.d3d11layers.feature-d2d: true gfx.crash-guard.d3d11layers.feature-d3d11: true gfx.crash-guard.status.d3d11layers: 2 gfx.crash-guard.status.d3d11video: 2 media.gmp-gmpopenh264.abi: x86-msvc-x64 media.gmp-gmpopenh264.lastUpdate: 1495460485 media.gmp-gmpopenh264.version: 1.6 media.gmp-manager.buildID: 20170504105526 media.gmp-manager.lastCheck: 1495460484 media.gmp-widevinecdm.abi: x86-msvc-x64 media.gmp-widevinecdm.lastUpdate: 1495460486 media.gmp-widevinecdm.version: 1.4.8.903 media.gmp.storage.version.observed: 1 media.hardware-video-decoding.failed: false network.cookie.prefsMigrated: true network.predictor.cleaned-up: true places.history.expiration.transient_current_max_pages: 85350 plugin.disable_full_page_plugin_for_types: application/pdf security.sandbox.content.tempDirSuffix: {69e7e8e9-4093-4c07-8904-30fb61ef2ed1} services.sync.declinedEngines: services.sync.engine.prefs.modified: false services.sync.lastPing: 1495460527 services.sync.lastSync: Mon May 22 2017 08:46:08 GMT-0500 (Central Standard Time) services.sync.numClients: 3 ui.osk.debug.keyboardDisplayReason: IKPOS: Touch screen not found.

Important Locked Preferences

Places Database

JavaScript

Incremental GC: true

Accessibility

Activated: false Prevent Accessibility: 0

Library Versions

NSPR Expected minimum version: 4.13.1 Version in use: 4.13.1

NSS Expected minimum version: 3.29.5 Version in use: 3.29.5

NSSSMIME Expected minimum version: 3.29.5 Version in use: 3.29.5

NSSSSL Expected minimum version: 3.29.5 Version in use: 3.29.5

NSSUTIL Expected minimum version: 3.29.5 Version in use: 3.29.5

Experimental Features

Sandbox

Content Process Sandbox Level: 1

The weirdness continues, Since I have firefox on my other laptop and it works correctly with Facebook I was looking at the differences in installed software. I noticed the problem child had Malwarebytes on it, an older version the free one. Since is was not running, (free version not trial) I though nothing of it. Today I thought I would remove it and see. It is now working correctly for the time being anyway. If it continues through the evening I would say it was Malwarebytes. Although how could something not running at all interfere with Firefox

After about 1/2 hour it is back to disappearing again, I deleted Firefox all folders and reference in the registry. Reinstalled and it does the same thing. I am at a loss. All add ons disabled Antivirus disabled. Still disappears.