Hi, sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of, and which is allowing you to see the offensive ads.

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

• Microsoft Safety Scanner
• MalwareBytes' Anti-Malware
• Anti-Rootkit Utility - TDSSKiller
• AdwCleaner (for more info, see this alternate AdwCleaner download page)
• Hitman Pro
• ESET Online Scanner

Note that not all removal programs will detect all malware, so you may need to run several or all of them.

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

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Also try (if you haven't already) the ad-blocker Adblock Plus.

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

Very good advice.

Adblock Plus {web link} Blocks annoying video ads on YouTube, Facebook ads, banners and much more. Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).

Adblock Plus Pop-up Addon {web link} Adblock Plus Pop-up Addon extends the blocking functionality of Adblock Plus to those annoying pop-up windows that open on mouse clicks and other user actions.

Forum; Adblock Plus Homepage {web link}

Why Firefox allow these in first place. Ad blocker don't work. I've tried

Is mozilla team not qualified?? Why take help of other apps

Firefox has its own ad blocker, but AdBlock works better.

umer163 said

Ad blocker don't work. I've tried

It works great for me. Is it enabled? Please post some of the web addresses you are talking about.

When a page comes up that you want blocked, right click an empty area and select Adblock Plus Popup Addon

The Firefox web browser itself does not come with a Ad blocker.

Any Ad blocker Extensions hosted at say addons.mozilla.org are made by a third-party author.

Some websites choose to show ads and sometimes they can unfortunately be of adult subject matter. Usually the ads are in relation to site subject or about some retail sites you have been to based on cookies. For example on a tv listing website I see some ads from Newegg because I have been there recently and did not clear the cookies for newegg.

Another reason for you to see ads of porn or malware nature can be due to your computer being infected by something.

The Firefox browser itself never inserts any ads in any websites.

An older kb article on this. http://kb.mozillazine.org/Parental_controls