diff --git a/pkgs/desktops/gnome/extensions/arcmenu/default.nix b/pkgs/desktops/gnome/extensions/arcmenu/default.nix
index a8fba0292176..f9c49111f529 100644
--- a/pkgs/desktops/gnome/extensions/arcmenu/default.nix
+++ b/pkgs/desktops/gnome/extensions/arcmenu/default.nix
@@ -24,7 +24,10 @@ stdenv.mkDerivation rec {
 
   makeFlags = [ "INSTALLBASE=${placeholder "out"}/share/gnome-shell/extensions" ];
 
-  passthru.extensionUuid = "arcmenu@arcmenu.com";
+  passthru = {
+    extensionUuid = "arcmenu@arcmenu.com";
+    extensionPortalSlug = "arcmenu";
+  };
 
   meta = with lib; {
     description = "Application menu for GNOME Shell, designed to provide a more traditional user experience and workflow";
diff --git a/pkgs/desktops/gnome/extensions/caffeine/default.nix b/pkgs/desktops/gnome/extensions/caffeine/default.nix
index 7cb98b569b7a..7ac5f916736e 100644
--- a/pkgs/desktops/gnome/extensions/caffeine/default.nix
+++ b/pkgs/desktops/gnome/extensions/caffeine/default.nix
@@ -11,7 +11,10 @@ stdenv.mkDerivation rec {
     sha256 = "0dyagnjmk91h96xr98mc177c473bqpxcv86qf6g3kyh3arwa9shs";
   };
 
-  passthru.extensionUuid = "caffeine@patapon.info";
+  passthru = {
+   extensionPortalSlug = "caffeine";
+   extensionUuid = "caffeine@patapon.info";
+  };
 
   nativeBuildInputs = [
     glib gettext
diff --git a/pkgs/desktops/gnome/extensions/clock-override/default.nix b/pkgs/desktops/gnome/extensions/clock-override/default.nix
index 9576bbf53e5b..1f749574c40c 100644
--- a/pkgs/desktops/gnome/extensions/clock-override/default.nix
+++ b/pkgs/desktops/gnome/extensions/clock-override/default.nix
@@ -10,7 +10,10 @@ stdenv.mkDerivation rec {
     stripRoot = false;
   };
 
-  passthru.extensionUuid = "clock-override@gnomeshell.kryogenix.org";
+  passthru = {
+    extensionUuid = "clock-override@gnomeshell.kryogenix.org";
+    extensionPortalSlug = "clock-override";
+  };
 
   nativeBuildInputs = [ gettext glib ];
 
diff --git a/pkgs/desktops/gnome/extensions/dash-to-dock/default.nix b/pkgs/desktops/gnome/extensions/dash-to-dock/default.nix
index cacce95008d7..ebf15cada970 100644
--- a/pkgs/desktops/gnome/extensions/dash-to-dock/default.nix
+++ b/pkgs/desktops/gnome/extensions/dash-to-dock/default.nix
@@ -24,7 +24,10 @@ stdenv.mkDerivation rec {
     "INSTALLBASE=${placeholder "out"}/share/gnome-shell/extensions"
   ];
 
-  passthru.extensionUuid = "dash-to-dock@micxgx.gmail.com";
+  passthru = {
+    extensionUuid = "dash-to-dock@micxgx.gmail.com";
+    extensionPortalSlug = "dash-to-dock";
+  };
 
   meta = with lib; {
     description = "A dock for the Gnome Shell";
diff --git a/pkgs/desktops/gnome/extensions/dash-to-panel/default.nix b/pkgs/desktops/gnome/extensions/dash-to-panel/default.nix
index 4acd8565e5e9..6e8beb70a230 100644
--- a/pkgs/desktops/gnome/extensions/dash-to-panel/default.nix
+++ b/pkgs/desktops/gnome/extensions/dash-to-panel/default.nix
@@ -17,7 +17,10 @@ stdenv.mkDerivation rec {
 
   makeFlags = [ "INSTALLBASE=$(out)/share/gnome-shell/extensions" ];
 
-  passthru.extensionUuid = "dash-to-panel@jderose9.github.com";
+  passthru = {
+    extensionUuid = "dash-to-panel@jderose9.github.com";
+    extensionPortalSlug = "dash-to-panel";
+  };
 
   meta = with lib; {
     description = "An icon taskbar for Gnome Shell";
diff --git a/pkgs/desktops/gnome/extensions/default.nix b/pkgs/desktops/gnome/extensions/default.nix
index a4255411934f..f98e2fb4e67a 100644
--- a/pkgs/desktops/gnome/extensions/default.nix
+++ b/pkgs/desktops/gnome/extensions/default.nix
@@ -1,5 +1,6 @@
 { lib
 , callPackage
+, callPackages
 , config
 }:
 let
@@ -60,8 +61,9 @@ in rec {
   gnome40Extensions = mapUuidNames (produceExtensionsList "40");
 
   gnomeExtensions = lib.recurseIntoAttrs (
-    (mapReadableNames (produceExtensionsList "40"))
-    // (callPackage ./manuallyPackaged.nix {})
+    (mapReadableNames
+      (lib.attrValues (gnome40Extensions // (callPackages ./manuallyPackaged.nix {})))
+    )
     // lib.optionalAttrs (config.allowAliases or true) {
       unite-shell = gnomeExtensions.unite; # added 2021-01-19
       arc-menu = gnomeExtensions.arcmenu; # added 2021-02-14
diff --git a/pkgs/desktops/gnome/extensions/drop-down-terminal/default.nix b/pkgs/desktops/gnome/extensions/drop-down-terminal/default.nix
index 414a67ccabda..ebcf918df103 100644
--- a/pkgs/desktops/gnome/extensions/drop-down-terminal/default.nix
+++ b/pkgs/desktops/gnome/extensions/drop-down-terminal/default.nix
@@ -11,7 +11,10 @@ stdenv.mkDerivation rec {
     sha256 = "0igfxgrjdqq6z6xg4rsawxn261pk25g5dw2pm3bhwz5sqsy4bq3i";
   };
 
-  passthru.extensionUuid = "drop-down-terminal@gs-extensions.zzrough.org";
+  passthru = {
+    extensionUuid = "drop-down-terminal@gs-extensions.zzrough.org";
+    extensionPortalSlug = "drop-down-terminal";
+  };
 
   patches = [
     (substituteAll {
diff --git a/pkgs/desktops/gnome/extensions/emoji-selector/default.nix b/pkgs/desktops/gnome/extensions/emoji-selector/default.nix
index a3706fbbe243..6f249bcb635d 100644
--- a/pkgs/desktops/gnome/extensions/emoji-selector/default.nix
+++ b/pkgs/desktops/gnome/extensions/emoji-selector/default.nix
@@ -11,7 +11,10 @@ stdenv.mkDerivation rec {
     sha256 = "0x60pg5nl5d73av494dg29hyfml7fbf2d03wm053vx1q8a3pxbyb";
   };
 
-  passthru.extensionUuid = "emoji-selector@maestroschan.fr";
+  passthru = {
+    extensionUuid = "emoji-selector@maestroschan.fr";
+    extensionPortalSlug = "emoji-selector";
+  };
 
   nativeBuildInputs = [ glib ];
 
diff --git a/pkgs/desktops/gnome/extensions/extensionRenames.nix b/pkgs/desktops/gnome/extensions/extensionRenames.nix
index 912e47a104e9..9df97998891f 100644
--- a/pkgs/desktops/gnome/extensions/extensionRenames.nix
+++ b/pkgs/desktops/gnome/extensions/extensionRenames.nix
@@ -14,6 +14,8 @@
   "lockkeys@fawtytoo" = "lock-keys-2";
 
 
+
+  # ############################################################################
   # These are conflicts for 3.38 extensions. They will very probably come back
   # once more of them support 40.
 
@@ -26,4 +28,24 @@
 
   # That extension is broken because of https://github.com/NixOS/nixpkgs/issues/118612
   #"flypie@schneegans.github.com" = null;
+
+
+
+  # ############################################################################
+  # Overrides for extensions that were manually packaged in the past but are gradually
+  # being replaced by automatic packaging where possible.
+  #
+  # The manually packaged ones:
+  "EasyScreenCast@iacopodeenosee.gmail.com" = "easyScreenCast"; # extensionPortalSlug is "easyscreencast"
+  "gnome-fuzzy-app-search@gnome-shell-extensions.Czarlie.gitlab.com" = "fuzzy-app-search"; # extensionPortalSlug is "gnome-fuzzy-app-search"
+  "TopIcons@phocean.net" = "topicons-plus"; # extensionPortalSlug is "topicons"
+  "paperwm@hedning:matrix.org" = "paperwm"; # is not on extensions.gnome.org
+  "no-title-bar@jonaspoehler.de" = "no-title-bar"; # extensionPortalSlug is "no-title-bar-forked"
+  # These extensions are automatically packaged at the moment. We preserve the old attribute name
+  # for backwards compatibility.
+  "appindicatorsupport@rgcjonas.gmail.com" = "appindicator"; # extensionPortalSlug is "appindicator-support"
+  "unredirect@vaina.lt" = "disable-unredirect"; # extensionPortalSlug is "disable-unredirect-fullscreen-windows"
+  "drawOnYourScreen@abakkk.framagit.org" = "draw-on-your-screen"; # extensionPortalSlug is "draw-on-you-screen"
+  "timepp@zagortenay333" = "timepp"; # extensionPortalSlug is "time"
+  "windowIsReady_Remover@nunofarruca@gmail.com" = "window-is-ready-remover"; # extensionPortalSlug is "window-is-ready-notification-remover"
 }
diff --git a/pkgs/desktops/gnome/extensions/freon/default.nix b/pkgs/desktops/gnome/extensions/freon/default.nix
index 5877fe6dc6cd..39224e6245b6 100644
--- a/pkgs/desktops/gnome/extensions/freon/default.nix
+++ b/pkgs/desktops/gnome/extensions/freon/default.nix
@@ -4,7 +4,10 @@ stdenv.mkDerivation rec {
   pname = "gnome-shell-extension-freon";
   version = "44";
 
-  passthru.extensionUuid = "freon@UshakovVasilii_Github.yahoo.com";
+  passthru = {
+    extensionUuid = "freon@UshakovVasilii_Github.yahoo.com";
+    extensionPortalSlug = "freon";
+  };
 
   src = fetchFromGitHub {
     owner = "UshakovVasilii";
diff --git a/pkgs/desktops/gnome/extensions/gsconnect/default.nix b/pkgs/desktops/gnome/extensions/gsconnect/default.nix
index 4eb92bf923f4..6afaacc00b88 100644
--- a/pkgs/desktops/gnome/extensions/gsconnect/default.nix
+++ b/pkgs/desktops/gnome/extensions/gsconnect/default.nix
@@ -98,7 +98,10 @@ stdenv.mkDerivation rec {
     done
   '';
 
-  passthru.extensionUuid = "gsconnect@andyholmes.github.io";
+  passthru = {
+    extensionUuid = "gsconnect@andyholmes.github.io";
+    extensionPortalSlug = "gsconnect";
+  };
 
   passthru = {
     tests = {
diff --git a/pkgs/desktops/gnome/extensions/icon-hider/default.nix b/pkgs/desktops/gnome/extensions/icon-hider/default.nix
index 446c7b0e26c6..b5b2ae8ec747 100644
--- a/pkgs/desktops/gnome/extensions/icon-hider/default.nix
+++ b/pkgs/desktops/gnome/extensions/icon-hider/default.nix
@@ -11,7 +11,10 @@ stdenv.mkDerivation rec {
     sha256 = "18c8zkdrmdbghqqz7b450vhgpykgz25mgigwn2nggcb2lxmvm9ks";
   };
 
-  passthru.extensionUuid = "icon-hider@kalnitsky.org";
+  passthru = {
+    extensionUuid = "icon-hider@kalnitsky.org";
+    extensionPortalSlug = "icon-hider";
+  };
 
   installPhase = ''
     runHook preInstall
diff --git a/pkgs/desktops/gnome/extensions/impatience/default.nix b/pkgs/desktops/gnome/extensions/impatience/default.nix
index 676bf8f053b0..867534ba61d0 100644
--- a/pkgs/desktops/gnome/extensions/impatience/default.nix
+++ b/pkgs/desktops/gnome/extensions/impatience/default.nix
@@ -28,7 +28,10 @@ stdenv.mkDerivation rec {
     runHook postInstall
   '';
 
-  passthru.extensionUuid = "impatience@gfxmonk.net";
+  passthru = {
+    extensionUuid = "impatience@gfxmonk.net";
+    extensionPortalSlug = "impatience";
+  };
 
   meta = with lib; {
     description = "Speed up builtin gnome-shell animations";
diff --git a/pkgs/desktops/gnome/extensions/manuallyPackaged.nix b/pkgs/desktops/gnome/extensions/manuallyPackaged.nix
index 4e30130774af..24048517a1d2 100644
--- a/pkgs/desktops/gnome/extensions/manuallyPackaged.nix
+++ b/pkgs/desktops/gnome/extensions/manuallyPackaged.nix
@@ -1,39 +1,39 @@
 { callPackage }:
 {
-  appindicator = callPackage ./appindicator { };
-  arcmenu = callPackage ./arcmenu { };
-  caffeine = callPackage ./caffeine { };
-  clipboard-indicator = callPackage ./clipboard-indicator { };
-  clock-override = callPackage ./clock-override { };
-  dash-to-dock = callPackage ./dash-to-dock { };
-  dash-to-panel = callPackage ./dash-to-panel { };
-  disable-unredirect = callPackage ./disable-unredirect { };
-  draw-on-your-screen = callPackage ./draw-on-your-screen { };
-  drop-down-terminal = callPackage ./drop-down-terminal { };
-  dynamic-panel-transparency = callPackage ./dynamic-panel-transparency { };
-  easyScreenCast = callPackage ./EasyScreenCast { };
-  emoji-selector = callPackage ./emoji-selector { };
-  freon = callPackage ./freon { };
-  fuzzy-app-search = callPackage ./fuzzy-app-search { };
-  gsconnect = callPackage ./gsconnect { };
-  hot-edge = callPackage ./hot-edge { };
-  icon-hider = callPackage ./icon-hider { };
-  impatience = callPackage ./impatience { };
-  material-shell = callPackage ./material-shell { };
-  mpris-indicator-button = callPackage ./mpris-indicator-button { };
-  night-theme-switcher = callPackage ./night-theme-switcher { };
-  no-title-bar = callPackage ./no-title-bar { };
-  noannoyance = callPackage ./noannoyance { };
-  paperwm = callPackage ./paperwm { };
-  pidgin-im-integration = callPackage ./pidgin-im-integration { };
-  sound-output-device-chooser = callPackage ./sound-output-device-chooser { };
-  system-monitor = callPackage ./system-monitor { };
-  taskwhisperer = callPackage ./taskwhisperer { };
-  tilingnome = callPackage ./tilingnome { };
-  timepp = callPackage ./timepp { };
-  topicons-plus = callPackage ./topicons-plus { };
-  unite = callPackage ./unite { };
-  window-corner-preview = callPackage ./window-corner-preview { };
-  window-is-ready-remover = callPackage ./window-is-ready-remover { };
-  workspace-matrix = callPackage ./workspace-matrix { };
+  "appindicatorsupport@rgcjonas.gmail.com" = callPackage ./appindicator { };
+  "arcmenu@arcmenu.com" = callPackage ./arcmenu { };
+  "caffeine@patapon.info" = callPackage ./caffeine { };
+  "clipboard-indicator@tudmotu.com" = callPackage ./clipboard-indicator { };
+  "clock-override@gnomeshell.kryogenix.org" = callPackage ./clock-override { };
+  "dash-to-dock@micxgx.gmail.com" = callPackage ./dash-to-dock { };
+  "dash-to-panel@jderose9.github.com" = callPackage ./dash-to-panel { };
+  "unredirect@vaina.lt" = callPackage ./disable-unredirect { };
+  "drawOnYourScreen@abakkk.framagit.org" = callPackage ./draw-on-your-screen { };
+  "drop-down-terminal@gs-extensions.zzrough.org" = callPackage ./drop-down-terminal { };
+  "dynamic-panel-transparency@rockon999.github.io" = callPackage ./dynamic-panel-transparency { };
+  "EasyScreenCast@iacopodeenosee.gmail.com" = callPackage ./EasyScreenCast { };
+  "emoji-selector@maestroschan.fr" = callPackage ./emoji-selector { };
+  "freon@UshakovVasilii_Github.yahoo.com" = callPackage ./freon { };
+  "gnome-fuzzy-app-search@gnome-shell-extensions.Czarlie.gitlab.com" = callPackage ./fuzzy-app-search { };
+  "gsconnect@andyholmes.github.io" = callPackage ./gsconnect { };
+  "hotedge@jonathan.jdoda.ca" = callPackage ./hot-edge { };
+  "icon-hider@kalnitsky.org" = callPackage ./icon-hider { };
+  "impatience@gfxmonk.net" = callPackage ./impatience { };
+  "material-shell@papyelgringo" = callPackage ./material-shell { };
+  "mprisindicatorbutton@JasonLG1979.github.io" = callPackage ./mpris-indicator-button { };
+  "nightthemeswitcher@romainvigier.fr" = callPackage ./night-theme-switcher { };
+  "noannoyance@daase.net" = callPackage ./noannoyance { };
+  "no-title-bar@jonaspoehler.de" = callPackage ./no-title-bar { };
+  "paperwm@hedning:matrix.org" = callPackage ./paperwm { };
+  "pidgin@muffinmad" = callPackage ./pidgin-im-integration { };
+  "sound-output-device-chooser@kgshank.net" = callPackage ./sound-output-device-chooser { };
+  "system-monitor@paradoxxx.zero.gmail.com" = callPackage ./system-monitor { };
+  "taskwhisperer-extension@infinicode.de" = callPackage ./taskwhisperer { };
+  "tilingnome@rliang.github.com" = callPackage ./tilingnome { };
+  "timepp@zagortenay333" = callPackage ./timepp { };
+  "TopIcons@phocean.net" = callPackage ./topicons-plus { };
+  "unite@hardpixel.eu" = callPackage ./unite { };
+  "window-corner-preview@fabiomereu.it" = callPackage ./window-corner-preview { };
+  "windowIsReady_Remover@nunofarruca@gmail.com" = callPackage ./window-is-ready-remover { };
+  "wsmatrix@martin.zurowietz.de" = callPackage ./workspace-matrix { };
 }
diff --git a/pkgs/desktops/gnome/extensions/night-theme-switcher/default.nix b/pkgs/desktops/gnome/extensions/night-theme-switcher/default.nix
index 52eef56a7434..0065fed4cff4 100644
--- a/pkgs/desktops/gnome/extensions/night-theme-switcher/default.nix
+++ b/pkgs/desktops/gnome/extensions/night-theme-switcher/default.nix
@@ -14,7 +14,10 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ unzip ];
   buildInputs = [ glib gnome.gnome-shell ];
 
-  passthru.extensionUuid = "nightthemeswitcher@romainvigier.fr";
+  passthru = {
+    extensionUuid = "nightthemeswitcher@romainvigier.fr";
+    extensionPortalSlug = "night-theme-switcher";
+  };
 
   installPhase = ''
     runHook preInstall
diff --git a/pkgs/desktops/gnome/extensions/no-title-bar/default.nix b/pkgs/desktops/gnome/extensions/no-title-bar/default.nix
index 518e3f78f642..e46b49c8f6ea 100644
--- a/pkgs/desktops/gnome/extensions/no-title-bar/default.nix
+++ b/pkgs/desktops/gnome/extensions/no-title-bar/default.nix
@@ -23,7 +23,9 @@ stdenv.mkDerivation rec {
 
   makeFlags = [ "INSTALLBASE=$(out)/share/gnome-shell/extensions" ];
 
-  passthru.extensionUuid = "no-title-bar@jonaspoehler.de";
+  passthru = {
+    extensionUuid = "no-title-bar@jonaspoehler.de";
+  };
 
   meta = with lib; {
     description = "Integrates maximized windows with the top panel";
diff --git a/pkgs/desktops/gnome/extensions/pidgin-im-integration/default.nix b/pkgs/desktops/gnome/extensions/pidgin-im-integration/default.nix
index 7f3ee00960cf..92e0bfe94d70 100644
--- a/pkgs/desktops/gnome/extensions/pidgin-im-integration/default.nix
+++ b/pkgs/desktops/gnome/extensions/pidgin-im-integration/default.nix
@@ -23,7 +23,10 @@ stdenv.mkDerivation rec {
     runHook postInstall
   '';
 
-  passthru.extensionUuid = "pidgin@muffinmad";
+  passthru = {
+    extensionUuid = "pidgin@muffinmad";
+    extensionPortalSlug = "pidgin-im-integration";
+  };
 
   meta = with lib; {
     homepage = "https://github.com/muffinmad/pidgin-im-gnome-shell-extension";
diff --git a/pkgs/desktops/gnome/extensions/sound-output-device-chooser/default.nix b/pkgs/desktops/gnome/extensions/sound-output-device-chooser/default.nix
index e166f8ca0835..e439e5b5a50a 100644
--- a/pkgs/desktops/gnome/extensions/sound-output-device-chooser/default.nix
+++ b/pkgs/desktops/gnome/extensions/sound-output-device-chooser/default.nix
@@ -27,7 +27,10 @@ stdenv.mkDerivation rec {
 
   dontBuild = true;
 
-  passthru.extensionUuid = "sound-output-device-chooser@kgshank.net";
+  passthru = {
+    extensionUuid = "sound-output-device-chooser@kgshank.net";
+    extensionPortalSlug = "sound-output-device-chooser";
+  };
 
   makeFlags = [
     "INSTALL_DIR=${placeholder "out"}/share/gnome-shell/extensions"
diff --git a/pkgs/desktops/gnome/extensions/system-monitor/default.nix b/pkgs/desktops/gnome/extensions/system-monitor/default.nix
index 31df563387b9..2179f63c1ebf 100644
--- a/pkgs/desktops/gnome/extensions/system-monitor/default.nix
+++ b/pkgs/desktops/gnome/extensions/system-monitor/default.nix
@@ -39,7 +39,10 @@ stdenv.mkDerivation rec {
     runHook postInstall
   '';
 
-  passthru.extensionUuid = "system-monitor@paradoxxx.zero.gmail.com";
+  passthru = {
+    extensionUuid = "system-monitor@paradoxxx.zero.gmail.com";
+    extensionPortalSlug = "system-monitor";
+  };
 
   meta = with lib; {
     description = "Display system informations in gnome shell status bar";
diff --git a/pkgs/desktops/gnome/extensions/taskwhisperer/default.nix b/pkgs/desktops/gnome/extensions/taskwhisperer/default.nix
index 66df4cf6f250..19936f6be61d 100644
--- a/pkgs/desktops/gnome/extensions/taskwhisperer/default.nix
+++ b/pkgs/desktops/gnome/extensions/taskwhisperer/default.nix
@@ -19,7 +19,10 @@ stdenv.mkDerivation rec {
     taskwarrior
   ];
 
-  passthru.extensionUuid = "taskwhisperer-extension@infinicode.de";
+  passthru = {
+    extensionUuid = "taskwhisperer-extension@infinicode.de";
+    extensionPortalSlug = "taskwhisperer";
+  };
 
   makeFlags = [
     "INSTALLBASE=${placeholder "out"}/share/gnome-shell/extensions"
diff --git a/pkgs/desktops/gnome/extensions/tilingnome/default.nix b/pkgs/desktops/gnome/extensions/tilingnome/default.nix
index 78a5a60dba3b..42c6467dba80 100644
--- a/pkgs/desktops/gnome/extensions/tilingnome/default.nix
+++ b/pkgs/desktops/gnome/extensions/tilingnome/default.nix
@@ -26,7 +26,10 @@ stdenv.mkDerivation rec {
     runHook postInstall
   '';
 
-  passthru.extensionUuid = "tilingnome@rliang.github.com";
+  passthru = {
+    extensionUuid = "tilingnome@rliang.github.com";
+    extensionPortalSlug = "tilingnome";
+  };
 
   meta = with lib; {
     description = "Tiling window management for GNOME Shell";
diff --git a/pkgs/desktops/gnome/extensions/unite/default.nix b/pkgs/desktops/gnome/extensions/unite/default.nix
index 8796305f046a..776139b36867 100644
--- a/pkgs/desktops/gnome/extensions/unite/default.nix
+++ b/pkgs/desktops/gnome/extensions/unite/default.nix
@@ -11,7 +11,10 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-Ys2kWPj/FugW/LkvLAZdbj7Ufg/KShC+EX6QrjKNVH8=";
   };
 
-  passthru.extensionUuid = "unite@hardpixel.eu";
+  passthru = {
+    extensionUuid = "unite@hardpixel.eu";
+    extensionPortalSlug = "unite";
+  };
 
   nativeBuildInputs = [ glib ];
 
diff --git a/pkgs/desktops/gnome/extensions/window-corner-preview/default.nix b/pkgs/desktops/gnome/extensions/window-corner-preview/default.nix
index d42a4d9541b9..ef0e22b7abed 100644
--- a/pkgs/desktops/gnome/extensions/window-corner-preview/default.nix
+++ b/pkgs/desktops/gnome/extensions/window-corner-preview/default.nix
@@ -13,7 +13,11 @@ stdenv.mkDerivation rec {
 
   dontBuild = true;
 
-  passthru.extensionUuid = "window-corner-preview@fabiomereu.it";
+  passthru = {
+    extensionUuid = "window-corner-preview@fabiomereu.it";
+    extensionPortalSlug = "window-corner-preview";
+  };
+
   installPhase = ''
     runHook preInstall
     mkdir -p $out/share/gnome-shell/extensions