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Recover an uninstalled version of Firefox

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CPU's intermittently would rev high and cause shut down. I opened task manager processes and CPU usage was high in Firefox. I clicked on Firefox and seven other Firefox dropped down. Not sure what that meant but, I then opened programs and noticed two versions on my computer, 82.0 and 84.0. I uninstalled 82.0 and now everything is gone. I reinstalled 84,0,2 but, it is "watered down" from the version before the uninstall. Please let me know how I can recover Firefox to before the uninstall. I'm running Windows 10 Home.

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