Firefox Tools for Tracking Down Browser Memory Leaks

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A developer guide explains how memory leaks in browser tabs can be measured and diagnosed using Firefox's built-in tools. It outlines common causes of leaks, such as event listeners that are never removed, closures holding large objects, accidental globals, uncleared timers, unbounded caches, and detached DOM trees. The article walks readers through using the about:memory page to take snapshots and interpret memory categories. It also describes the DevTools Memory panel, where heap snapshots can be compared and sorted by retained size to find objects holding the most memory. Code examples show how leaks occur and how to fix them by clearing references and removing listeners.

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