In web browsers, a plug-in (also called plugin, addin, add-in, addon, add-on, snap-in or snapin) consists of a computer program that interacts with a host application (a web browser or an email client, for example) to provide a certain, usually very specific, function "on demand". Add-on is often considered the general term comprising plug-ins, extensions, and themes as subcategories.
Mozilla Firefox is a free and open source web browser descended from the Mozilla Application Suite and managed by Mozilla Corporation. A Net Applications statistic put Firefox at 24.41% of the recorded usage share of web browsers as of January 2010, making it the second most popular browser in terms of current use worldwide after Microsoft's Internet Explorer, and the most used browser independent of any one operating system. Other sources put Firefox's usage share at between 21% and 32% and generally trending upward.
Netscape's web browser was once dominant in terms of usage share, but lost most of that share to Internet Explorer during the first browser war. By the end of 2006, the usage share of Netscape browsers had fallen, from over 90% in the mid 1990s, to less than 1%. Netscape developed the Secure Sockets Layer Protocol (SSL) for securing online communication, which is still widely used, as well as JavaScript, the most widely-used language for client-side scripting of web pages.
Safari is a web browser developed by Apple. First released as a public beta on January 7, 2003 on the company's Mac OS X operating system, it became Apple's default browser beginning with Mac OS X v10.3 "Panther." Safari is also the native browser for the iPhone OS. A version of Safari for the Microsoft Windows operating system, first released on June 11, 2007, supports Windows XP, Windows Vista, and Windows 7. The current stable release of the browser is 4.0.4 for both Mac OS X and Windows.
Opera is a web browser and Internet suite developed by the Opera Software company. The browser handles common Internet-related tasks such as displaying web sites, sending and receiving e-mail messages, managing contacts, chatting on IRC clients, downloading files via BitTorrent, and reading Web feeds. Opera is offered free of charge for personal computers and mobile phones.
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