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Firefox maxing out CPU, runtime broker process on Windows 10
On a Dell XPS laptop with Windows 10 and the latest versions of both Windows and Firefox, shortly after starting the browser a process called "Runtime Broker" uses all the CPU in two or three short bursts, causing the fan to run at the highest speed, draining power, and causing the OS to crash today. This has been happening for about two weeks after installing the latest updates for Windows and Firefox. Several tabs are open in the browser. The report is being submitted in Edge, so troubleshooting information isn't given yet. I will update it when I can successfully open Firefox.
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System details: User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36 Edge/18.18363 Windows Version 10.0.18363 Build 18363 BaseBoard Product XPS 15 9530 BIOS Version/Date Dell Inc. A12, 6/13/2019