Earlier quoted context omitted.
As a side note, GMail memory usage has improved vastly (probably because it was monstruous to begin with). Years ago my GMail tab consumed almost 500 Mb, but nowadays it uses less than 100, with my same usage patterns.
300MB onload, dropped to 240MB after idling for few minutes. Are you sure it's using less than 100MB? in comparison with the post, it takes about 500MB ram, which is weird for such simple webpage. This HN page takes 40MB.
Funny how Firefox reports a third of that, although IDK if Chrome and Firefox task managers are directly comparable.