Thank you for the report. Does this happen everytime you launch firefox? Or only when you browse specific websites maybe?
Could you please run the following command in a terminal? apport-collect 1920986 ** Changed in: firefox (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1920986 Title: i have a high cpu use whene i open firefox Status in firefox package in Ubuntu: Incomplete Bug description: hello i have a high cpu use whene i open firefox in the terminal i type top and have 130 % webcon+ and 135 % firefox thanks ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: ubuntu-release-upgrader-core 1:20.04.30 ProcVersionSignature: Ubuntu 5.8.0-45.51~20.04.1-generic 5.8.18 Uname: Linux 5.8.0-45-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.16 Architecture: amd64 CasperMD5CheckResult: skip CrashDB: ubuntu CurrentDesktop: ubuntu:GNOME Date: Tue Mar 23 19:40:52 2021 InstallationDate: Installed on 2021-03-22 (1 days ago) InstallationMedia: Ubuntu 20.04.2 LTS "Focal Fossa" - Release amd64 (20210204) PackageArchitecture: all SourcePackage: ubuntu-release-upgrader Symptom: release-upgrade UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1920986/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp