I restarted my computer 3 time.I launched FF and the top command. The home page 
of FF is https://www.bing.com/?cc=be. I opened a second tab with 
maps.google.com. Everything was find. I lauched system monitor and then, the 
CPU of one core jumped to 100 %, even after closing the maps.google.com tab 
(see screenshot).
When I'm in system monitor, the tab Ressources take 100 % of 1 CPU. If I switch 
to the tab Processes and change the ordering of the list, it goes down. When I 
come back to the Ressources tab, it reaches again the top. Same thing if I go 
from the Ressources view to the File System tab and back to the Resources tab 
(see screenshot from 11:50 AM).

** Attachment added: "System monitor screen shot"

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  High CPU usage in gnome-shell & Xorg when using Firefox

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