Go to http://acid3.acidtests.org. After the test runs, click on the "this reference rendering" link. Use the command-[ key equivalent to go back, leaving the cursor over the link. Crash in deleteLineBoxes. I'll attach the backtrace.
Created attachment 19317 [details] backtrace of crash
IMO it's duplicate of bug 17471.
*** This bug has been marked as a duplicate of 17471 ***