It crashes when I try to open 30 tabs all at once by clicking on "Open in Tabs" in the folder submenu of the Bookmarks menu.
Created attachment 15490 [details] Dr.Watson Crash Log
The crash log shows the crash is happening in code within Safari.exe. It's likely this will need to be moved to Radar.
Created attachment 15493 [details] List of URLs that are being opened which cause the crash
<rdar://problem/5331446>
Moving bug to Radar as the crash appears to be within Safari code.
Attachment contents removed for privacy reasons.