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Why this as detailed below?

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Small Firefox icon with black border and 'do not enter' icon constantly appear on screen - desktop and every program loaded blotting out numbers in accounting programs and words in WP programs. Icons disappear when computer is restarted.

Screenshot attached

Small Firefox icon with black border and 'do not enter' icon constantly appear on screen - desktop and every program loaded blotting out numbers in accounting programs and words in WP programs. Icons disappear when computer is restarted. Screenshot attached
Attached screenshots

Modified by tmarts

Chosen solution

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 is causing the problem.

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

Installed Plug-ins

  • Shockwave Flash 32.0 r0

Application

  • User Agent: Mozilla/5.0 (Windows NT 10.0; rv:66.0) Gecko/20100101 Firefox/66.0

More Information

FredMcD
  • Top 10 Contributor
4246 solutions 59404 answers

tmarts said

. . . . and every program loaded blotting out numbers in accounting programs and words in WP programs.

Nothing about Firefox should do anything in other programs, or are you accessing those files using Firefox?


Start Firefox in Safe Mode {web link}

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

''tmarts [[#question-1257775|said]]'' <blockquote> . . . . and every program loaded blotting out numbers in accounting programs and words in WP programs. </blockquote> Nothing about Firefox should do anything in other programs, or are you accessing those files using Firefox? ----------- [https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode] {web link} A small dialog should appear. Click '''Start In Safe Mode''' (not Refresh). Is the problem still there?
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Wesley Branton
  • Top 10 Contributor
593 solutions 5013 answers

Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.

You can try these free programs to scan for malware, which work with your existing antivirus software:

Microsoft Security Essentials is a good permanent antivirus for Windows 7/Vista if you don't already have one. Windows 8/10 have antivirus protection built-in.

Further information can be found in the Troubleshoot Firefox issues caused by malware article.

Did this fix your problems? Please report back to us!

Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of. You can try these free programs to scan for malware, which work with your existing antivirus software: * [https://www.microsoft.com/en-us/wdsi/products/scanner Microsoft Safety Scanner] * [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware] * [http://support.kaspersky.com/viruses/disinfection/5350 Anti-Rootkit Utility - TDSSKiller] (for more info, see this [https://www.bleepingcomputer.com/download/tdsskiller/ alternate TDSSKiller download page]) * [https://www.malwarebytes.com/adwcleaner/ AdwCleaner] (for more info, see this [http://www.bleepingcomputer.com/download/adwcleaner/ alternate AdwCleaner download page]) * [http://www.surfright.nl/en/hitmanpro/ Hitman Pro] * [http://www.eset.com/us/online-scanner/ ESET Online Scanner] [https://support.microsoft.com/help/14210/security-essentials-download Microsoft Security Essentials] is a good permanent antivirus for Windows 7/Vista if you don't already have one. Windows 8/10 have antivirus protection [https://www.microsoft.com/windows/comprehensive-security built-in]. Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article. Did this fix your problems? Please report back to us!
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Question owner

Not accessing any programs in Firefox.

Not accessing any programs in Firefox.
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Wesley Branton
  • Top 10 Contributor
593 solutions 5013 answers

Helpful Reply

Have you tried simply restarting your computer? The little Firefox icon kind of looks like it's just a visual glitch from the Windows Start Menu. Restarting your computer should fix that.

Have you tried simply restarting your computer? The little Firefox icon kind of looks like it's just a visual glitch from the Windows Start Menu. Restarting your computer should fix that.
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Question owner

Yes. As I posted in the question, the icons disappear when I restart the computer. Your analysis seems on the money. Also, I ran a 2-hour scan with MSERT. Nothing was detected. Thanks!

Yes. As I posted in the question, the icons disappear when I restart the computer. Your analysis seems on the money. Also, I ran a 2-hour scan with MSERT. Nothing was detected. Thanks!
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cor-el
  • Top 10 Contributor
  • Moderator
17475 solutions 157940 answers

Chosen Solution

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 is causing the problem.

  • switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Themes
  • do NOT click the "Refresh Firefox" button on the Safe Mode start window
Start Firefox in <u>Safe Mode</u> to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if <u>hardware acceleration</u> is is causing the problem. *switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Themes *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
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