CFCs, HCFCs, and Halon: The ozone layer is destroyed by CFC's, chlorofluorocarbons, that are used as a propellant in aerosol cans, and refrigerants in older cars and refrigerators. When Chlorofluorocarbons (Freon and other CFCs) and Bromofluorocarbons (Halons) they became popular refrigerants and fire fighting agents.
Anyways, let's come to out topic. Yahoo! Browser. Yahoo is the No.1 site on the web. Having the maximum traffic, it's still ruling in the laexa rank. Now, just to get all it's pages open properly and work nicely, Yahoo! joined hands with Microsoft in making a Yahoo! friendly browser. And here it is, YAHOO! Browser.
The Company focuses on informing, connecting and entertaining its users with its search (Yahoo search), communications, including Yahoo Mail and Yahoo Messenger, and digital content products, including Tumblr, and its four verticals, such as Yahoo News, Yahoo Sports, Yahoo Finance and Yahoo Lifestyle.