The "Show All Tabs View" crashes the entire Webkit app once it is activated. Regular Macmini with a keyboard and a mouse, no swiping gestures used. It was working perfectly until r177573. After that with any update it keeps crashing. I have many tabs open in a single window. If I switch tabs by scrolling on the tabs bar everything works excellent. Once I activate the tabs view, Webkit waits for some 1-2 seconds and than crashes (forecloses the entire app).
Created attachment 243765 [details] Crash Report
*** This bug has been marked as a duplicate of bug 139934 ***