The issue allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via Javascript that leads to memory corruption. This includes problems with `nsListControlFrame::FireMenuItemActiveEvent`, buffer overflows in the string class in out-of-memory conditions, table row and column groups, anonymous box selectors outside of UA stylesheets, stale references to removed nodes, and running the `crypto.generateCRMFRequest` callback on deleted context.