Almost the same as bug 5541:
AtomicString is non-functional at Safari startup, when bookmarks are imported, which causes a crash as soon as it is used (which happens to be in HTMLNames::init()).
Steps to reproduce:
1. Launch MSIE at least once, to make it write out its bookmarks
2. defaults write com.apple.Safari IEFavoritesWereImported 0
Results: Safari crashes
Created attachment 7021 [details]
Comment on attachment 7021 [details]