I have followed procedure for turning off New Tab page but it still interrupts and leads to unwanted sites, e.g casinos etc. 最近的回答https://support.mozilla.org/zh-CN/questions/10408362015-01-11T04:16:24-08:00Sounds that you have some malware on your computer.
Do a malware check with several malware scanning2015-01-11T04:16:24-08:00cor-elhttps://support.mozilla.org/zh-CN/questions/1040836#answer-675905<p>Sounds that you have some malware on your computer.
</p><p>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.
</p><p>Make sure that you update each program to get the latest version of their databases before doing a scan.
</p>
<ul><li>Malwarebytes' Anti-Malware:<br><a href="http://www.malwarebytes.org/mbam.php" rel="nofollow">http://www.malwarebytes.org/mbam.php</a>
</li><li>AdwCleaner:<br><a href="http://www.bleepingcomputer.com/download/adwcleaner/" rel="nofollow">http://www.bleepingcomputer.com/download/adwcleaner/</a><br><a href="http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml" rel="nofollow">http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml</a>
</li><li>SuperAntispyware:<br><a href="http://www.superantispyware.com/" rel="nofollow">http://www.superantispyware.com/</a>
</li><li>Microsoft Safety Scanner:<br><a href="http://www.microsoft.com/security/scanner/en-us/default.aspx" rel="nofollow">http://www.microsoft.com/security/scanner/en-us/default.aspx</a>
</li><li>Windows Defender:<br><a href="http://windows.microsoft.com/en-us/windows/using-defender" rel="nofollow">http://windows.microsoft.com/en-us/windows/using-defender</a>
</li><li>Spybot Search &amp; Destroy:<br><a href="http://www.safer-networking.org/en/index.html" rel="nofollow">http://www.safer-networking.org/en/index.html</a>
</li><li>Kasperky Free Security Scan:<br><a href="http://www.kaspersky.com/security-scan" rel="nofollow">http://www.kaspersky.com/security-scan</a>
</li></ul>
<p>You can also do a check for a rootkit infection with TDSSKiller.
</p>
<ul><li>Anti-rootkit utility TDSSKiller:<br><a href="http://support.kaspersky.com/5350?el=88446" rel="nofollow">http://support.kaspersky.com/5350?el=88446</a>
</li></ul>
<p>See also:
</p>
<ul><li>"Spyware on Windows": <a href="http://kb.mozillazine.org/Popups_not_blocked" rel="nofollow">http://kb.mozillazine.org/Popups_not_blocked</a>
</li><li><a href="https://support.mozilla.org/kb/troubleshoot-firefox-issues-caused-malware" rel="nofollow">https://support.mozilla.org/kb/troubleshoot-firefox-issues-caused-malware</a>
</li></ul>Hi,
It sounds like a setting was changed on your new tab page. These changes are usually caused by 2015-01-11T03:14:17-08:00deadrathttps://support.mozilla.org/zh-CN/questions/1040836#answer-675895<p>Hi,
</p><p>It sounds like a setting was changed on your new tab page. These changes are usually caused by third-party toolbars or add-ons. I understand that you would like to know how to change it back. Not a problem, please follow the steps below:
</p>
<ol><li> In the <a href="/en-US/kb/address-bar-autocomplete-firefox" rel="nofollow">Location bar</a>, type <strong>about:config</strong> and press <strong>Enter</strong>. The "<em>This might void your warranty!</em>" warning page may appear.
</li><li> Click <strong>I'll be careful, I promise!</strong> to continue to the about:config page.
</li><li> Type <strong>browser.newtab.url</strong> in the search box to find it on the list.
</li><li> Double-click on <strong>browser.newtab.url</strong> and type in <em>about:newtab</em> in the window that pops up.
</li></ol>
<p>Restart Firefox and open a new tab to make sure the change was made. If there is any issues with plugins please also see: <a href="/en-US/kb/troubleshoot-issues-with-plugins-fix-problems" rel="nofollow">Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems</a>
</p><p>Please post back with your results, we are happy to help.
</p>