|Developer(s)||Fenrir Inc, Osaka, Japan|
|Operating system||Windows 98 to Windows 7, but starting at version 3.0.2, only Windows XP, Windows Vista, Windows 7 and Mac OS X 10.6/10.7 iOS|
Sleipnir is a tabbed web browser developed by Fenrir Inc. The browser's main features are customization and tab functions. It supports HTML5 and the engine of Internet Explorer 9 (Trident). As of 2012/06/28, version 18.104.22.16800, support for the WebKit rendering engine was implemented and Gecko rendering engine support was terminated.
Sleipnir was originally developed by Yasuyuki Kashiwagi. In November 2004, the computer containing Sleipnir's source code was stolen. In 2005, Kashiwagi established Fenrir & Co. to start development of a new version of Sleipnir. Starting with version 2, the new versions are not compatible with the original.
The latest stable version, 4.0, was released on March 26, 2013.
Sleipnir was included in a browser ballot screen on the EU edition of Windows 7 (not in May 2011)[clarification needed] (and XP and Vista with an update), so EU users of Windows 7 may choose between Internet Explorer and other browsers during the installation process.
In the Windows version, the browser's layout engine can be changed to either Internet Explorer's Trident or Mozilla's Gecko. Other features include tab grouping, mouse gestures, page zooming, a search bar, Greasemonkey-like user script support, and plugin support. WebKit rendering has been implemented, and as of May 17, 2012, is in alpha version stages. 
Bookmarks on Sleipnir can be synced with different platform, using a function called Fenrir Pass.
Sleipnir 3 for Windows: Includes tab options, tab groups, Touchpaging to flick between tabs using your mouse, and mouse gestures.
Sleipnir 2 for Windows: Sleipnir 2 features customizable functions and add-ons created by users. Sleipnir 2 is one of the few browsers to still support Windows 98.
Sleipnir 3 for Mac: Switch tabs by swiping tabs left or right-click
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