Users amalahi and bakir have reported that this is caused by a program called Anti Phishing Domain Advisor from Panda. See question 811399.

This worked for me

http://en.kioskea.net/faq/15289-google-nginx-404-error

Thanks for trying but no good.

@meclarke - Can you provide the links of the website on which you are having problems ??

I tried , as suggested to find questions/873619#answer-249674 on here. And guess what I got 404 not found nginx. Anything that has a Firefox/Google link is a no no

On which websites are you getting this message when you try to access them ??? Can you provide links to those web pages ??

Clear Cookies & Cache

• https://support.mozilla.com/en-US/kb/Template:clearCookiesCache

Clear the Network Cache

• https://support.mozilla.com/en-US/kb/How%20to%20clear%20the%20cache#w_clear-the-cache

Troubleshooting extensions and themes

• https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes

Check and tell if its working while you are Browsing in Firefox Safe Mode.

I am getting problems when Firefox and Google even in safe mode, when I use Firefox and Bing there is no problem, I have only just found this out , so maybe my problem is with Google

-> Is my Firefox problem a result of MALWARE ??

• Popups Not Blocked - http://kb.mozillazine.org/Popups_not_blocked

-> Do a MALWARE check with these 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. Also, Close All other Applications (softwares) before Starting to Run Scans.

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

Check and tell if its working.