I uninstalled all the non-default extensions and deleted the extensions folder as you said.
I rebooted then: 246.2 MB at 10:19 in the morning 449.6 10:45 - then just left the PC on but did not use it. 2.5 GB 16:49 3.0 GB 17:50 Both previously and after removing the extensions today, if I issue the [alt-F2 r] command, the memory drops back down to 250 MB from however many GBs it is. settings.txt is as follows. It shows extensions as active that have been removed (not present in either extensions app or via Firefox extensions addon). Note that apart from audio output switcher, caffeine, clipboard indicator and night theme switcher, all the others were uninstalled previously, even many months ago. org.gnome.shell always-show-log-out true org.gnome.shell command-history ['electrum', 'libreoffice', 'densify', 'rpi-imager', 'sudo nautilus', 'firefox-esr -p', 'pdf-shuffler', 'pdfshuffler', 'e', 'firefox -p', 'firefox', 'zoom-client', 'zoom', 'r'] org.gnome.shell disable-user-extensions false org.gnome.shell favorite-apps ['org.gnome.Nautilus.desktop', 'thunderbird.desktop', 'firefox.desktop', 'brave_brave.desktop', 'keepassxc_keepassxc.desktop', 'signal-desktop.desktop', 'libreoffice-startcenter.desktop', 'zotero.desktop', 'qownnotes_qownnotes.desktop', 'io.freetubeapp.FreeTube.desktop', 'deezer-unofficial-player_deezer-unofficial-player.desktop', 'org.gnome.Calculator.desktop', 'org.gnome.gedit.desktop', 'gnome-system-monitor.desktop', 'org.gnome.Terminal.desktop', 'gnome-control-center.desktop'] org.gnome.shell disable-extension-version-validation false org.gnome.shell app-picker-layout [{'activity-log-manager.desktop': <{'position': <0>}>, 'software-properties-drivers.desktop': <{'position': <1>}>, 'ipscan.desktop': <{'position': <2>}>, 'asunder.desktop': <{'position': <3>}>, 'b6610f32-e5f8-4c19-bc38-5ffe59aa2b03': <{'position': <4>}>, '110b1d27-41cd-4692-bad9-b284b2550360': <{'position': <5>}>, 'brasero.desktop': <{'position': <6>}>, 'brave_brave.desktop': <{'position': <7>}>, 'org.gnome.Calculator.desktop': <{'position': <8>}>, 'org.gnome.Calendar.desktop': <{'position': <9>}>, 'chromium_chromium.desktop': <{'position': <10>}>, 'cxmenu-cxoffice-0-29ra4ke-CrossOver.desktop': <{'position': <11>}>}, {'45811740-3c10-4b96-96f1-32ece2f7beb5': <{'position': <0>}>, 'c1fafecf-7cfc-46b9-9f34-a17946350ce2': <{'position': <1>}>, '3efb6382-8cc9-4e63-a83d-6f493d6e7eea': <{'position': <2>}>, '04e9ab59-946d-45fc-8cf9-2d1f30687c87': <{'position': <3>}>, 'appimagelaunchersettings.desktop': <{'position': <4>}>, 'org.gnome.Extensions.desktop': <{'position': <5>}>, 'org.gnome.Nautilus.desktop': <{'position': <6>}>, 'firefox.desktop': <{'position': <7>}>, 'firefox-esr.desktop': <{'position': <8>}>, 'e1aad5c4-1dd4-4c70-8a84-a5010cfa497a': <{'position': <9>}>, 'gufw.desktop': <{'position': <10>}>, '32f57fbf-667c-468f-93a3-28b0dff8d90d': <{'position': <11>}>, 'io.freetubeapp.FreeTube.desktop': <{'position': <12>}>, 'gparted.desktop': <{'position': <13>}>, '9af87983-c744-460a-9c8b-440255bb12f7': <{'position': <14>}>, 'appimagekit_5f3a07c34a5b4731d926c6884d6bc2b9-Cryptomator.desktop': <{'position': <15>}>, 'appimagekit_5a114e2dbad5c64c2fde237f05d90b5e-balena-etcher-electron.desktop': <{'position': <16>}>, 'fslint-unofficial_fslint-unofficial.desktop': <{'position': <17>}>, '6f02e5b1-1082-4f71-b004-acdc909db025': <{'position': <18>}>, 'appimagekit_aefcfd08d8a93b10918d58f719d262c5-electrum.desktop': <{'position': <19>}>, 'org.kde.kdenlive.desktop': <{'position': <20>}>, 'protonvpn.desktop': <{'position': <21>}>, 'deezer-unofficial-player_deezer-unofficial-player.desktop': <{'position': <22>}>}, {'guvcview.desktop': <{'position': <0>}>, 'htop.desktop': <{'position': <1>}>, 'org.gnome.eog.desktop': <{'position': <2>}>, 'keepass2.desktop': <{'position': <3>}>, 'keepassxc_keepassxc.desktop': <{'position': <4>}>, 'kodi.desktop': <{'position': <5>}>, '0c9c6ea8-a25b-4757-841e-b475a3cbfd63': <{'position': <6>}>, '8f5a5ea6-02b3-497c-8bc3-c41cb5790b9a': <{'position': <7>}>, 'menulibre.desktop': <{'position': <8>}>, '115aa591-ddd8-4b00-9e59-8245b2ae8334': <{'position': <9>}>, '14da8e16-d6b7-4c6d-bdcb-338dcedf8fe5': <{'position': <10>}>, 'dev.alextren.Spot.desktop': <{'position': <11>}>, 'dae0aaf1-4f08-4c3c-86af-efd2ba79a28d': <{'position': <12>}>}, {'mpv.desktop': <{'position': <0>}>, 'org.gnome.Music.desktop': <{'position': <1>}>, 'com.nextcloud.desktopclient.nextcloud.desktop': <{'position': <2>}>, 'nvidia-settings.desktop': <{'position': <3>}>, 'org.gnome.seahorse.Application.desktop': <{'position': <4>}>, 'org.gnome.PowerStats.desktop': <{'position': <5>}>, 'pavucontrol.desktop': <{'position': <6>}>, 'pymol-oss_pymol-oss.desktop': <{'position': <7>}>, 'qownnotes_qownnotes.desktop': <{'position': <8>}>, 'rhythmbox.desktop': <{'position': <9>}>, 'gnome-control-center.desktop': <{'position': <10>}>, 'shotwell.desktop': <{'position': <11>}>, 'signal-desktop.desktop': <{'position': <12>}>, 'skype_skypeforlinux.desktop': <{'position': <13>}>}, {'906a4218-2e08-482b-ba6a-c39aa32e066a': <{'position': <0>}>, 'soundconverter.desktop': <{'position': <1>}>, 'b3ebcc95-c87f-431b-aabf-47412a29b547': <{'position': <2>}>, 'c0b5451e-4281-4c7a-95ca-b98974c7897f': <{'position': <3>}>, 'steam.desktop': <{'position': <4>}>, 'Sundry': <{'position': <5>}>, 'supertuxkart.desktop': <{'position': <6>}>, 'hardinfo.desktop': <{'position': <7>}>, 'TaxCalcHub.desktop': <{'position': <8>}>, 'com.teamviewer.TeamViewer.desktop': <{'position': <9>}>, 'org.gnome.gedit.desktop': <{'position': <10>}>, 'thunderbird.desktop': <{'position': <11>}>, 'time.desktop': <{'position': <12>}>, 'timeshift-gtk.desktop': <{'position': <13>}>, '46c0649b-b105-4678-a0ef-c5b659300c93': <{'position': <14>}>, 'transmission-gtk.desktop': <{'position': <15>}>, 'org.gnome.tweaks.desktop': <{'position': <16>}>}, {'Utilities': <{'position': <0>}>, 'veracrypt.desktop': <{'position': <1>}>, 'virtualbox.desktop': <{'position': <2>}>, 'vlc.desktop': <{'position': <3>}>, 'wireshark.desktop': <{'position': <4>}>, '06500345-0f6b-4621-ac7f-17efd42c49e6': <{'position': <5>}>, 'y-ppa-manager.desktop': <{'position': <6>}>, 'zoom-client_zoom-client.desktop': <{'position': <7>}>, 'zotero.desktop': <{'position': <8>}>}] org.gnome.shell had-bluetooth-devices-setup false org.gnome.shell looking-glass-history @as [] org.gnome.shell enabled-extensions ['gsconn...@andyholmes.github.io', 'ubuntu-d...@ubuntu.com', 'ubuntu-appindicat...@ubuntu.com', 'sound-output-device-choo...@kgshank.net', 'darkthemetog...@jacob.mischka.me', 'desktop-c...@schneegans.github.com', 'audio-output-switcher@anduchs', 'clipboard-indica...@tudmotu.com', 'nightthemeswitc...@romainvigier.fr'] org.gnome.shell disabled-extensions ['nightshellswitc...@romainvigier.fr', 'caffe...@patapon.info'] org.gnome.shell development-tools true org.gnome.shell introspect false org.gnome.shell remember-mount-password true org.gnome.shell welcome-dialog-last-shown-version '40.5' org.gnome.shell.keybindings switch-to-application-4 ['<Super>4'] org.gnome.shell.keybindings switch-to-application-7 ['<Super>7'] org.gnome.shell.keybindings toggle-message-tray ['<Super>v', '<Super>m'] org.gnome.shell.keybindings toggle-application-view ['<Super>a'] org.gnome.shell.keybindings focus-active-notification ['<Super>n'] org.gnome.shell.keybindings switch-to-application-2 ['<Super>2'] org.gnome.shell.keybindings switch-to-application-5 ['<Super>5'] org.gnome.shell.keybindings switch-to-application-8 ['<Super>8'] org.gnome.shell.keybindings open-application-menu ['<Super>F10'] org.gnome.shell.keybindings toggle-overview ['<Super>s'] org.gnome.shell.keybindings switch-to-application-3 ['<Super>3'] org.gnome.shell.keybindings switch-to-application-6 ['<Super>6'] org.gnome.shell.keybindings switch-to-application-9 ['<Super>9'] org.gnome.shell.keybindings shift-overview-up ['<Super><Alt>Up'] org.gnome.shell.keybindings switch-to-application-1 ['<Super>1'] org.gnome.shell.keybindings shift-overview-down ['<Super><Alt>Down'] -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1955058 Title: gnome-shell memory use climbs to multiple GBs Status in gnome-shell package in Ubuntu: Incomplete Bug description: Gnome Shell memory use grows over time Memory for Gnome Shell can be around 2.5 GB, sometimes more. If I do Alt-F2 r to restart shell, it drops to 250 MB and then slowly climbs up again. Occasionally it goes so high on my 16 GB machine that it swaps and crashes. ProblemType: Bug DistroRelease: Ubuntu 21.10 Package: gnome-shell 40.5-1ubuntu2 ProcVersionSignature: Ubuntu 5.13.0-22.22-generic 5.13.19 Uname: Linux 5.13.0-22-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.11-0ubuntu71 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: ubuntu:GNOME Date: Thu Dec 16 16:53:53 2021 DisplayManager: gdm3 InstallationDate: Installed on 2017-09-03 (1565 days ago) InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412) RelatedPackageVersions: mutter-common 40.5-1ubuntu3~21.10.1 SourcePackage: gnome-shell UpgradeStatus: Upgraded to impish on 2021-10-16 (61 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1955058/+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