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" https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1773502/+attachment/5144606/+files/Capture%20d%E2%80%99%C3%A9cran%20de%202018-05-26%2011-50-40.png -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1773502 Title: High CPU usage in gnome-shell & Xorg when using Firefox To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1773502/+subscriptions -- desktop-bugs mailing list email@example.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs