Browser wars

A rough estimation of the usage share of major web browsers by layout engines over time.
The term "browser wars" is the name given to the competition for dominance in the web browser marketplace. The term is most commonly used to refer to two specific periods of time: the particularly intense struggle between Internet Explorer and Netscape Navigator during the late 1990s, and the growing threat which Mozilla Firefox poses to Internet Explorer from 2004 onward.
Early browser competition
In the early 1990s there were many simple graphic-oriented World Wide Web browsers available. The first which reached widespread popularity was Mosaic, developed at NCSA. Several companies licensed it to create their own commercial browsers, such as Spry Mosaic and Spyglass Mosaic.
One of the Mosaic developers, Marc Andreesen founded the company Mosaic Communications Corporation and created a new web browser named Mozilla. To resolve legal issues with NCSA, the company was renamed Netscape Communications Corporation and the browser Netscape Navigator. The Netscape browser improved on Mosaic's usability and reliability, and it soon dominated the market, helped by the fact that "evaluation copies" of the browser were downloadable without restrictions or cost.
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The first round of browser wars
By mid-1995, popular culture had begun to notice the web, and Netscape Navigator was the most used web browser at that time. Microsoft licensed Mosaic as the basis of Internet Explorer 1.0 which it released as part of the Microsoft Windows 95 Plus Pack in August 1995. Internet Explorer 2.0 was released three months later, and by then the race was on.
New versions of Netscape Navigator (later Netscape Communicator) and Internet Explorer were released at a rapid pace over the following few years. Features often took priority over bug fixes, and therefore the browser wars were a time of unstable browsers, shaky Web standards compliance, frequent crashes, security holes, and lots of user headaches. Internet Explorer only began to approach par with its competition with version 3.0 (1996), which offered scripting support and the market's first commercial Cascading Style Sheets implementation.
In October 1997, Internet Explorer 4.0 was released. The release party in San Francisco featured a ten-foot-tall letter "e" logo. Netscape employees showing up to work the following morning found that giant logo on their front lawn, with a sign attached which read "From the IE team." The Netscape employees promptly knocked it over and set a giant figure of their Mozilla dragon mascot atop it, holding a sign reading "Netscape 72, Microsoft 18" (representing the market distribution). [1]
Internet Explorer 4 changed the tides of the browser wars. It was faster and it adopted the W3C's published specifications more faithfully than Netscape Navigator 4.0. Unlike Netscape, it provided the possibility for truly "dynamic" pages in which the flow of the text and images of the page could be altered after the page was loaded. Installing Internet Explorer 4.0 was considered as a system upgrade that would provide more capabilities such as MP3 playback.
During these times it was common for web designers to display 'best viewed in Netscape' or 'best viewed in Internet Explorer' logos. These images often identified a specific browser version and were commonly linked to a source from which the "preferred" browser could be downloaded. To some extent, these logos were indicative of the divergence between the "standards" supported by the browsers and signified which browser was used for testing the pages. Supporters of the notion that web sites should be interoperable with any browser started the "Viewable With Any Browser" campaign.
A lot was at stake for these two companies involved in the browser wars. A popular web browser could earn a great deal of money: search engine companies would bid to be the default tool used in the web browser, and other companies with a web presence would bid to be listed in the default set of bookmarks which was preinstalled with the browser. Since a web browser is a powerful gateway to a great deal of information, the company which controlled this gateway could conceivably have a great deal of influence over its users.