Internet Explorer is the world's most popular and useable Web browser. 

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SeaMonkey consists of a web browser (SeaMonkey Navigator), which is a descendant of the Netscape family, an e-mail and news client program (SeaMonkey Mail & Newsgroups, which shares code with Mozilla Thunderbird), an HTML editor (SeaMonkey Composer) and an IRC client (ChatZilla). The software suite supports skins. It comes with two skins in the default installation, Modern and Classic.

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Features include tabbed browsing, spell checking, incremental find, live bookmarking, smart bookmarks, a download manager, private browsing, location-aware browsing (also known as "geolocation") based on a Google service^[29] and an integrated search system that uses Google by default in most localizations. Functions can be added through extensions, created by third-party developers,^[30] of which there is a wide selection, a feature that has attracted many of Firefox's users.
Additionally, Firefox provides an environment for web developers in which they can use built-in tools, such as the Error Console or the DOM Inspector, or extensions, such as Firebug.

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Safari offers numerous features, including:

• Ability to save webpage clips for viewing on the Apple Dashboard (Mac OS X only)
• A resizable web-search box in the toolbar which allows choice among Google, Yahoo! or Bing only
• Automatic filling in of web forms ("autofill")
• Bookmark integration with Address Book
• Bookmark management
• Built-in password management via Keychain (Mac OS X only)
• History and bookmark search
• Expandable text boxes
• ICC color profile (version 4) support
• Inline PDF viewing (Mac OS X only)
• iPhoto integration (Mac OS X only)
• Mail integration (Mac OS X only)
• Pop-up ad blocking
• Private browsing
• Quartz-style font smoothing
• Reader mode, for viewing an uncluttered version of Web articles
• Spell checking
• Subscribing to and reading web feeds
• Support for CSS 3 web fonts
• Support for CSS animation
• Support for HTML5
• Support for Transport Layer Security protocol (version unknown)
• Tabbed browsing
• Text search
• Web Inspector, a DOM Inspector-like utility that lets users and developers browse the Document Object Model of a web page^[44]

Safari's Web Inspector, showing the DOM tree for this page.

On Mac OS X, Safari is a Cocoa application.^[45] It uses Apple's WebKit for rendering web pages and running JavaScript. WebKit consists of WebCore (based on Konqueror's KHTML engine) and JavaScriptCore (originally based on KDE's JavaScript engine, named KJS). Like KHTML and KJS, WebCore and JavaScriptCore are free software and are released under the terms of the GNU Lesser General Public License. Some Apple improvements to the KHTML code are merged back into the Konqueror project. Apple also releases additional code under an open source 2-clause BSD-like license.
Until Safari 6.0, it included a built-in web feed aggregator that supported the RSS and Atom standards. Current features include Private Browsing (a mode in which no record of information about the user's web activity is retained by the browser),^[46] a "Ask websites not to track me" privacy setting, the ability to archive web content in WebArchive format, the ability to e-mail complete web pages directly from a browser menu, the ability to search bookmarks, and the ability to share tabs between all Macs and iOS devices running appropriate versions of software via an iCloud account.

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Main article: Features of the Opera web browser

See also: Opera Mobile#Features, Opera Mini#Features, Nintendo DS & DSi Browser#Features, and Internet Channel#Features

Opera includes built-in tabbed browsing, ad blocking, fraud protection, a download manager and BitTorrent client, a search bar, and a web feed aggregator. Opera also comes with an e-mail client called Opera Mail and an IRC chat client built in.
Opera includes a "Speed Dial" feature, which allows the user to add an unlimited number of pages shown in thumbnail form in a page displayed when a new tab is opened. Thumbnails of the linked pages are automatically generated and used for visual recognition on the Speed Dial page or can be modified using Opera Image Dial Generator. Once set up, this feature allows the user to more easily navigate to the selected web pages.
Opera is extensible in a third way via plug-ins, relatively small programs that add specific functions to the browser, and as of Opera 11, third-party extensions. However, Opera limits what plug-ins can do. Additionally, "User JavaScript" may be used to add custom JavaScript to web pages.

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Google Chrome aims to be secure, fast, simple and stable. There are extensive differences from its peers in Chrome's minimalistic user interface, which is atypical of modern web browsers. For example, Chrome does not render RSS feeds. One of Chrome's strengths is its application performance and JavaScript processing speed, both of which were independently verified by multiple websites to be the swiftest among the major browsers of its time. Many of Chrome's unique features had been previously announced by other browser developers, but Google was the first to implement and publicly release them. For example, a prominent graphical user interface (GUI) innovation, the merging of the address bar and search bar (the Omnibox), was first announced by Mozilla in May 2008 as a planned feature for Firefox. Both Internet Explorer 9 and Safari (version 6) have since merged the search and address bar.

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