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Why your Firefox is not using multiple processes
With the arrival of Firefox 54 last week, finally the drawn out process of releasing its multiprocess Electrolysis was finished.
In its latest release, Firefox will use up to four processes, with the benefits to users being better memory usage and performance.
But long-time users of Mozilla's browser may be disappointed to see that their browser is clinging to a single process -- and the guilty party are those add-ons you've probably been using for years.
To check if Firefox 54 is stuck on one process, you can check your nearest operating system process monitor, or check if the value attached to dom.ipc.processCount value in Firefox's about:config is set to 1.
Why your Firefox is not using multiple processes | ZDNetFirefox provides little feedback on this front, but if you install the Add-on Compatibility Reporter extension, a wealth of information appears in Firefox's Extensions panel.