Mozilla Firefox Developer Edition 46 – More memory tooling, improved @media sidebar and more

Firefox Developer Edition 46 is now here! In this version, we’ve added various memory profiling features and improved many of our current tools as well. This post covers some of the big changes that landed in this release.

Dominator view in the memory tool

A new view is now available within the Memory Tool that will aid in debugging and profiling memory intensive web applications. Dominator view provides insight into object memory allocation. This is a cumulative view indicating the size of the objects (shallow) and any referenced objects (retained) that are currently allocated. This allows you to easily see the impact a particular object is having on memory. Using this view also lets developers quickly locate the code responsible for creating a specific object. You can read more about this feature here.

Here’s a screenshot of the Dominator view:

Screenshot of the dominators view in Firefox DevTools

Performance tool and GC profiling

The performance tool now allows you to include allocations in your recordings. This is useful to help you reduce the amount of GC done in your web app for more responsiveness. You can enable allocations in the performance tool by clicking on the settings cog, then by checking the “Record Allocations” menu item.

Here’s a screenshot of the Allocations view:

Screenshot of 'allocations view' in performance tool

Read more @ Mozilla Hacks