This problem: https://support.mozilla.org/en-US/questions/932643 (read the OP, the first post mentioning .pulse-cookie, and the last post by me)

Long story short, I need a way to figure out what operation .pulse-cookie and the Firefox menus have in common. I imagine some sort of memory-related trace can do this. I have some experience with bug-tracing and memory-tracing, but believe me, don't know a thing about it all.