According to the Ubuntu Firefox changelogs this was fixed in May 2006. According to upstream bug report, patches for this were committed to the 1.8 trunk in April 2006. So I'll change the status of this bug report from "Fix commited" to "Fix released".
** Changed in: firefox (Ubuntu) Status: Fix Committed => Fix Released -- Firefox leaks memory if the clipboard contains 500001 bytes or more https://launchpad.net/bugs/41093 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs