There are many useful Add-ons to Mozilla Firefov.
One I recommend is "Web Of Trust" (WOT)because it will warn you when you are about to load a disreputable website that could harm your computer.
To install this Add-on, launch Mozilla Firfox, click "Tools" and in the drop down menu click "Add-ons"
Click "Get Add-ons"
Type "wot" in the search box.
Click "Add to Firefox".
Click "Install Now".
Click "Restart Firefox".
Firefox will tell you when websites are safe by displaying a green circle beside the link. A red circle means taht the website is disreputable. A warning will also be displayed if you try to link to a direputable site
