On Sun, 17 Jan 2021 10:02:55 +0000 (UTC), RJH wrote:

Why does Firefox use so much memory - over 1GB on a Mac? Chrome
(my main browser) and Safari use 100-200MB.

Marketers don't see saving a few hundred MB of system memory as an
important objective. Most laptops are sold with at least 4GB and
typically 8. If the memory is there, why wouldn't the apps use it?