Performance:Leak Tools for Users
From MozillaWiki
Only some of our memory leak debugging tools can be used by end users (e.g., users of nightly builds).
Contents
Tools that can be used without restarting
If a user notices that Firefox is using an unexpectedly large amount of memory, but doesn't regularly see the problem, then a tool that doesn't require restarting the browser is required.
about:memory
Cycle collector dumps
See Performance:Cycle Collector Dumps.