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Mozilla Firefox
Mozilla Firefox launched in November 2004, developed by the Mozilla Foundation as a lighter, faster alternative built from the codebase of the earlier Netscape Navigator browser and its open-source successor project, Mozilla Application Suite. Firefox played a historically significant role breaking Microsoft Internet Explorer's near-total browser market dominance in the mid-2000s, becoming the first browser to meaningfully challenge Internet Explorer's share after years of stagnant competition following the end of the first browser wars. The browser became particularly known for pioneering a robust extension and add-on ecosystem, letting users heavily customize browser functionality, and Firefox has remained one of the most prominent non-corporate-backed, open-source browser projects in an industry increasingly dominated by browsers tied to major tech companies. Mozilla Firefox's combination of its historic role breaking Internet Explorer's market dominance and its sustained identity as a major independent, open-source browser has made it one of the most significant browsers in internet history.
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Internet Explorer
Internet Explorer launched in August 1995, bundled directly with Microsoft Windows 95, and it went on to dominate the browser market so completely by the early 2000s that it became the subject of a major United States antitrust case examining Microsoft's bundling practices. Internet Explorer's market dominance, at one point reaching an estimated 95 percent global browser market share, gave Microsoft outsized influence over web standards during the late 1990s and early 2000s, a period often criticized by web developers for widespread compatibility issues caused by IE-specific quirks. Microsoft officially retired Internet Explorer in June 2022, formally ending support and redirecting remaining users to Microsoft Edge, closing out a run of nearly three decades that had spanned the browser's total market dominance through its long decline against Firefox and Chrome. Internet Explorer's combination of its unprecedented historic market dominance and its central role in a landmark Microsoft antitrust case has made it one of the most consequential pieces of software in the history of the internet.
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