Have you been seeing the Mozilla Crash Reporter dialog? The data collected for the crash report might point to the specific plugin. Please check the last section of the support article "Firefox Crashes" for steps to get those crash report IDs, and then post some of the recent ones here.

Now... here's the catch: nearly all plugins are discovered by Firefox after installation through a registry scan. Sometimes they also get dropped into Firefox's program folder or into your personal settings folder after Firefox is installed. For this reason, it's probably most efficient to deal with them now.

Open the Add-ons page using either:

• Ctrl+Shift+a
• "3-bar" menu button (or Tools menu) > Add-ons

In the left column, click Plugins. Here you can change them to "Never Activate". Except that for Shockwave Flash, I suggest "Ask to Activate" since there might be a video you want to see here or there.

Then create a new window (Ctrl+n) and test whether you can get into Yahoo safely. Any luck?

ID: 58487089-4286-40cd-bf06-d112e2141118 Yeah the crash reporter comes up every time. And it crashes if I have the plugins active or inactive or in safemode. I read something that says if it happens in safemode then it's not a plugin issue?

https://crash-stats.mozilla.com/report/index/58487089-4286-40cd-bf06-d112e2141118

lspent7.dll looks like4 the cause of that crash. Google for Ispent7.dll

A quick look at those search results indicates it is some type of Malware or Hi-jack.

Maybe a few more Crash Report ID's might help us.

Anything that is involved with LSP (i.e. links itself in the network connection) is suspicious.

• http://www.pearlsoftware.com/resources/UserGuide7.pdf

Do a malware check with several malware scanning programs on the Windows computer. Please scan with all programs because each program detects different malware. All these programs have free versions.

Make sure that you update each program to get the latest version of their databases before doing a scan.

• Malwarebytes' Anti-Malware:
  http://www.malwarebytes.org/mbam.php
• AdwCleaner:
  http://www.bleepingcomputer.com/download/adwcleaner/
  http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml
• SuperAntispyware:
  http://www.superantispyware.com/
• Microsoft Safety Scanner:
  http://www.microsoft.com/security/scanner/en-us/default.aspx
• Windows Defender:
  http://windows.microsoft.com/en-us/windows/using-defender
• Spybot Search & Destroy:
  http://www.safer-networking.org/en/index.html
• Kasperky Free Security Scan:
  http://www.kaspersky.com/security-scan

You can also do a check for a rootkit infection with TDSSKiller.

• Anti-rootkit utility TDSSKiller:
  http://support.kaspersky.com/5350?el=88446

See also:

• "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked
• https://support.mozilla.org/kb/troubleshoot-firefox-issues-caused-malware