Firefox Developer Edition 44, released last week, includes a brand new memory tool to help you understand how your web applications are using and retaining memory. This is especially useful for developers targeting the mobile web, and thus working with constrained resources. Baptiste Kaenel, a freelance Creative Designer and Mozilla community member from France, put together a fantastic video demonstrating how to use this powerful new tool.
The Memory tool works by taking snapshots of everything in memory, and presenting them as a tree/table with various grouping settings. By default, the contents are grouped by “coarse type,” where each thing in memory falls into one of four classifications:
- Other: Miscellaneous structures that do not fit in the above categories.
The list of snapshots also includes the total MB of memory accounted for in the snapshot. You can take several snapshots to help determine at a glance whether your application’s memory usage is growing or shrinking over time.
To learn more, check out the Memory tool documentation on MDN, and remember, we want to hear from you! Download Firefox Developer Edition today, and let us know what tools or enhancements you want to see next by leaving a comment or tweeting at @FirefoxDevTools.
About Dan Callahan
Engineer with Mozilla Developer Relations, former Mozilla Persona developer.
About Nick Fitzgerald
Nick loves Free Software, '90s hip-hop, Greg Egan novels, and Doug Fir trees. He blogs infrequently at fitzgeraldnick.com, and you can find him on IRC as