Yes, scaling is not supported on X11. You need to use Wayland backend for it.
-- 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/1905337 Title: Scaling of Firefox doesn't adjust when moved across Monitors with Different DPis Status in Mozilla Firefox: Won't Fix Status in firefox package in Ubuntu: New Bug description: Firefox doesn't automatically scale up/down when dragged across screens with different DPis like other apps and keeps the Scaling of the monitor it was opened on. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: firefox 83.0+build2-0ubuntu0.20.04.1 ProcVersionSignature: Ubuntu 5.4.0-54.60-generic 5.4.65 Uname: Linux 5.4.0-54-generic x86_64 AddonCompatCheckDisabled: False ApportVersion: 2.20.11-0ubuntu27.12 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: patrick 1854 F.... pulseaudio /dev/snd/controlC0: patrick 1854 F.... pulseaudio BuildID: 20201112153044 CasperMD5CheckResult: skip Channel: Unavailable CurrentDesktop: ubuntu:GNOME Date: Mon Nov 23 18:40:44 2020 DefaultProfileExtensions: extensions.sqlite corrupt or missing DefaultProfileIncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite) DefaultProfileLocales: extensions.sqlite corrupt or missing DefaultProfilePrefErrors: Unexpected character ',' before close parenthesis @ /usr/lib/firefox/omni.ja:greprefs.js:354 DefaultProfileThemes: extensions.sqlite corrupt or missing ForcedLayersAccel: False InstallationDate: Installed on 2020-11-18 (5 days ago) InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731) IpRoute: default via 192.168.1.1 dev wlp2s0 proto dhcp metric 600 169.254.0.0/16 dev wlp2s0 scope link metric 1000 192.168.1.0/24 dev wlp2s0 proto kernel scope link src 192.168.1.11 metric 600 Profile0Extensions: extensions.sqlite corrupt or missing Profile0IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite) Profile0Locales: extensions.sqlite corrupt or missing Profile0PrefErrors: Unexpected character ',' before close parenthesis @ /usr/lib/firefox/omni.ja:greprefs.js:354 Profile0PrefSources: prefs.js Profile0Themes: extensions.sqlite corrupt or missing Profiles: Profile1 (Default) - LastVersion=None/None (Out of date) Profile0 - LastVersion=83.0/20201112153044 (In use) RunningIncompatibleAddons: False SourcePackage: firefox UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/09/2020 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.11.10 dmi.board.name: 02TH5P dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 31 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.11.10:bd07/09/2020:svnDellInc.:pnPrecision55302-in-1:pvr:rvnDellInc.:rn02TH5P:rvrA00:cvnDellInc.:ct31:cvr: dmi.product.family: Precision dmi.product.name: Precision 5530 2-in-1 dmi.product.sku: 08AC dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/firefox/+bug/1905337/+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