Sleipnir 3.7.4 (Windows) has just been released and it includes some modifications as well as a set of repairs.
The changes present in the new build include adding the "Show close button in tabs" setting to the tab customization section of the web browser. Also modified is the tab width when showing them in multiple lines; this is now fixed. Another modification is updating the WebKit version to 537.4.
As far as repairs are concerned, Sleipnir 3.7.4 dealt with issues such as mouse gestures not working when the browser was started with a blank tab in WebKit. On the same note, in the current build, tabs should be saved in the list of closed tabs when they are closed at the same time. Further fixing refers to page search not being removed. Download Sleipnir; also available in portable form.