Changes

One can then use the script mozilla/tools/trace-malloc/diffbloatdump.pl to compare trace-malloc dumps before and after doing an action that might leak. If there are significant differences, it might be worth examining the call stacks for the destructors of the objects in question to see what is extending their lifetime. (This can be done by examining the unprocessed output of an XPCOM_MEM_REFCNT_LOG, one of the nsTraceRefcnt logs.) You should use the --use-address argument to diffbloatdump.pl, and then the diff tree can be run through fix-linux-stack fix_linux_stack.py / fix-macosx-stack fix_macosx_stack.py as appropriate.