This is the Refcount Balancer. See https://developer.mozilla.org/en-US/docs/Mozilla/Performance/Refcount_tracing_and_balancing for documentation. Note that the `fix_stacks.py` script is used in several other places in the repository. Previous CVS history for the perl scripts is available at: http://www.mozilla.org/webtools/bonsai/cvslog.cgi?file=mozilla-org/html/performance/find-leakers.pl&rev=&root=/cvsroot/ http://www.mozilla.org/webtools/bonsai/cvslog.cgi?file=mozilla-org/html/performance/make-tree.pl&rev=&root=/cvsroot/