I think Firefox devs restart it many times a day during development, so they are not as affected. I think with 24GB of RAM I am at least on the edge of tons of

I think Firefox devs restart it many times a day during development, so they are not as affected. I think with 24GB of RAM I am at least on the edge of tons of memory qualifier and it still seems not enough after few weeks or intensive usage. Nevertheless it's baffling for me not to return the memory, but it's the default with small (roughly less than a page) allocations, because of how brk/sbrk work, Firefox should strive to do better.