The Local structure here https://searchfox.org/mozilla-central/source/third_party/rust/crossbeam-epoch/src/internal.rs#287 is 2104 bytes long. When compiled into Firefox and using the jamalloc memory allocator this is rounded up to 4096 bytes (a very common practice). This wastes just under 12KB for a Firefox process that loads a simple website. It'd be nice if it could allocate 2048 bytes or less saving this memory.

Thanks.