I wonder if we could add something to Firefox input like "Report Firefox using too much memory" we could then upload the contents of about:memory. This can help us get a better picture of when our users have the perception that we're using too much memory. It also gives us a better opportunity to discover memory leaks that are happening in the field.
The above a approach kind of worked a few years back, with [[User:dbaron|dbaron]]'s memleak perl script and later extension.