FireFox memory usage

Jan Beich jbeich at
Fri Sep 15 13:50:01 UTC 2017

Andrea Venturoli <ml at> writes:

> Hello.
> I'm on 10.3/amd64 with firefox-esr 52.3.0.
> Since a few days my 4GiB desktop is crawling due to swap usage and
> looking at top, I see FireFox using almost 7GiB of RAM (SIZE column),
> 2.5 of which are "RES".

Check about:memory and Devolper Tools -> Memory for clues. For more
advanced debugging (DMD, Refcount tracing) you'd need a custom build.

Firefox on FreeBSD is known to consume more memory than on other
platforms because it uses system jemalloc rather than mozjemalloc.
Mozilla doesn't test memory usage without mozjemalloc. However, porting
mozjemalloc has stalled[1] unless someone helps.


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