In what way is the file attached to Firefox?

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

• Don't make any changes on the Safe mode start window.
• https://support.mozilla.com/kb/Safe+Mode
• Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

See also:

• http://kb.mozillazine.org/Preferences_not_saved

Do a malware check with some malware scanning programs.
You need to scan with all programs because each program detects different malware.
Make sure that you update each program to get the latest version of their databases before doing a scan.

• http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
• http://www.superantispyware.com/ - SuperAntispyware
• http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
• http://www.safer-networking.org/en/index.html - Spybot Search & Destroy
• http://www.lavasoft.com/products/ad_aware_free.php - Ad-Aware Free

See also:

• "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

I have done all of that through assistance by McAfee. They checked my laptop remotely twice. No viruses. They said it was a search engine (Firefox) issue, and left it up to me to check with Firefox tech support. I got instructions from the tech support a short time ago.

click start type %appdata% hit enter double click Mozilla delete Firefox

When I tried this, I was told that I required permission from myself (and I am the administrator) to change the folder. There were two options, click "continue" or click "skip". I tried both, and neither would let me continue, even though I am the administrator.

See these threads about Plasmoo:

• /questions/814777
• /questions/814487