An add-on for Firefox Developer Tools that allows inspection of the memory consumption of a page. The add-on adds a new 'Memory' tab to the toolbox, which can even be toggled from the toolbox options panel. It works by sampling the memory consumption of the browser every second and retaining the measurements relevant to the current tab. It then creates a graph that shows the changes in the page's memory footprint over time, making it possible to identify leaks or erratic behavior.
Pre-build packages can be found in the build/ directory.