Memory leaks: finding and preventing?

[Michael Schuerig]

I'm looking for strategies to find and prevent unnecessary memory
consumption. This includes real memory leaks caused by browser bugs, of
course, but beyond that I'm also thinking of closures that retain
references to objects that aren't going to be accessed anymore.

There are approaches to these two problems that I can think of, such as
executing code in loop and watching memory consumption. I'd like to
know if there are other, systematic strategies.

Michael