That's a really tough problem to solve on Linux. We're actively working on it in order to make Firefox better behaved when memory gets tight but it's not easy.

That's a really tough problem to solve on Linux. We're actively working on it in order to make Firefox better behaved when memory gets tight but it's not easy. You can follow the work in these two bugs: https://bugzilla.mozilla.org/show_bug.cgi?id=1532955 https://bugzilla.mozilla.org/show_bug.cgi?id=1532955 https://bugzilla.mozilla.org/show_bug.cgi?id=1587762 https://bugzilla.mozilla.org/show_bug.cgi?id=1587762