1 set XPCOM_MEM_LEAK_LOG=filename 2 start mozilla and go to http://lxr.mozilla.org/seamonkey/source/layout/html/base/src/nsPresShell.cpp 3 when the first page finishes loading, CTRL-N to open a new window 4 in the new window, go to http://lxr.mozilla.org/seamonkey/source/layout/html/base/src/nsPresShell.cpp again 5 exit 6 check out the log file If you exit after loading the page once, the total leakage is 6K Follow all the steps and the total leakage is 7.3 megs If you open the new window before the first page finishes loading, you can cut the total leakage down to 3.7 megs. according to the leak log, the major offenders are: HTMLAttribute 734944 Bytes HTMLAttributesImpl 1872480 Bytes nsClassList 249688 Bytes nsGenericElement 1222656 Bytes nsTextNode 3276720 Bytes

Could this be the generic "New Window" leak described in bug 84136?

it could be. I'll apply the patch from that bug and see what happens to this one.

Comments on that bug say the existing patch on the bug doesn't fix the leak.

the leak is gone, looks like this is a dup of 84136 *** This bug has been marked as a duplicate of 84136 ***