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 ***