Namo CyberFence 2.0 is a Popup Blocker product from namo.com.
Try to use Namo CyberFence, it allows you to check and find out what videos they watch, and they can block the harmful videos from playing..
Namo CyberFence allows you to check and find out what videos your kid watch. It also blocks adult video clips from YouTube. Otherwise, you can block whole YouTube.com
Blocking youtube may cost money, or if you have the right computer settings you may be able to block it with that. An option to block youtube from your kids or family is buying a parent control package with a website blocking section. go to start => control panel => internet options => go into the security tab => you'll see a red circle with a slash like in it that will say restricted sites, go into it, then go down to the right side and you will see sites, click on the that tab, then go to under where it says " Add websie to this zone" and put in www.youtube.com, then press enter,and your done. If you have vista look into parental control, go to "create new user account", the enter a name, press on block some websites, then go to where it says allow some website and block some websites, then press on the little choice thingy next to where i says allow or block only websites on the list, then go to edit the allow and block list, then enter the sites u allow and don't allow. Otherwise, try to use Namo CyberFence. They block Porn Video files, websites, and also block & monitor Youtube history. They have all features what I need to protect or control for my son's PC activities.
Quick answer: Just copy/paste https://addons.mozilla.org/en-US/firefox/downloads/file/26562/leechblock-0.4.1-fx.xpi into the Firefox address bar, and use that program to block sites. Long answer: For one, you can block images from loading in Youtube just by going into the Preferences, the Content tab, and where it says "load images automatically" you click "exceptions" and add youtube.com. If you want to actually block a website, you're gonna need 3rd party software. One option is Internet Security software with site-filtering tools. Some new operating systems also have similar tools built in. But the best bet is to get a free Firefox Add-on like FoxFilter, LeechBlock, or BlockSite. FoxFilter, though not Mac OS X compatible, is the most comprehensive, allowing password protection and blocking of specific types of content. LeechBlock is a more simple option, allowing you to block specific sites during specifc times of the day, plus it is also cross-platform and compatible with Firefox 3. My last choice would be BlockSite, which simply blocks sites you specify. I don't think that any of the Firefox add-ons would be hard to get around, since they could be disabled or you could use a different browser. FoxFilter may not be disabled unless you put in a password, I'm not sure. I really don't know about LeechBlock, and FoxFilter specifically says it is too easy to disable to be effective for parental controls. FoxFilter: https://addons.mozilla.org/en-US/firefox/addon/4351 LeechBlock: https://addons.mozilla.org/en-US/firefox/addon/4476 BlockSite: https://addons.mozilla.org/en-US/firefox/addon/3145 Also try this quick tutorial http://jaxov.com/2009/08/how-to-block-websites-in-internet-explorer-and-mozilla-firefox/