diff --git a/pkgs/applications/networking/browsers/firefox/packages.nix b/pkgs/applications/networking/browsers/firefox/packages.nix
index 1a213567ff770..d841e0532864c 100644
--- a/pkgs/applications/networking/browsers/firefox/packages.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages.nix
@@ -120,33 +120,4 @@
       versionSuffix = "esr";
     };
   };
-
-  firefox-esr-115 = buildMozillaMach rec {
-    pname = "firefox-esr-115";
-    version = "115.16.1esr";
-    applicationName = "Mozilla Firefox ESR";
-    src = fetchurl {
-      url = "mirror://mozilla/firefox/releases/${version}/source/firefox-${version}.source.tar.xz";
-      sha512 = "eca42b3494fdab73e67d5c8e8b76520729adb75b5cad85172953dba56b225b0f05dcfea70fe8cc3e1bf1cd3d7103159cc20095d5480bb1b0e6d3ec90588988a8";
-    };
-
-    meta = {
-      changelog = "https://www.mozilla.org/en-US/firefox/${lib.removeSuffix "esr" version}/releasenotes/";
-      description = "A web browser built from Firefox Extended Support Release source tree";
-      homepage = "http://www.mozilla.com/en-US/firefox/";
-      maintainers = with lib.maintainers; [ hexa ];
-      platforms = lib.platforms.unix;
-      badPlatforms = lib.platforms.darwin;
-      broken = stdenv.buildPlatform.is32bit; # since Firefox 60, build on 32-bit platforms fails with "out of memory".
-                                             # not in `badPlatforms` because cross-compilation on 64-bit machine might work.
-      license = lib.licenses.mpl20;
-      mainProgram = "firefox";
-    };
-    tests = [ nixosTests.firefox-esr-115 ];
-    updateScript = callPackage ./update.nix {
-      attrPath = "firefox-esr-115-unwrapped";
-      versionPrefix = "115";
-      versionSuffix = "esr";
-    };
-  };
 }
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index 4e5a8edb0b1eb..b5879bfbaee89 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -370,6 +370,8 @@ mapAliases ({
   findimagedupes = throw "findimagedupes has been removed because the perl bindings are no longer compatible"; # Added 2023-07-10
   finger_bsd = bsd-finger;
   fingerd_bsd = bsd-fingerd;
+  firefox-esr-115 = throw "The Firefox 115 ESR series has reached its end of life. Upgrade to `firefox-esr` or `firefox-esr-128` instead.";
+  firefox-esr-115-unwrapped = throw "The Firefox 115 ESR series has reached its end of life. Upgrade to `firefox-esr-unwrapped` or `firefox-esr-128-unwrapped` instead.";
   firefox-wayland = firefox; # Added 2022-11-15
   firmwareLinuxNonfree = linux-firmware; # Added 2022-01-09
   fishfight = jumpy; # Added 2022-08-03
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index b816765816206..f8fe5a9ed96ee 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -30991,7 +30991,6 @@ with pkgs;
   firefox-unwrapped = firefoxPackages.firefox;
   firefox-beta-unwrapped = firefoxPackages.firefox-beta;
   firefox-devedition-unwrapped = firefoxPackages.firefox-devedition;
-  firefox-esr-115-unwrapped = firefoxPackages.firefox-esr-115;
   firefox-esr-128-unwrapped = firefoxPackages.firefox-esr-128;
   firefox-esr-unwrapped = firefoxPackages.firefox-esr-128;
 
@@ -31017,12 +31016,6 @@ with pkgs;
     wmClass = "firefox-esr";
     icon = "firefox-esr";
   };
-  firefox-esr-115 = wrapFirefox firefox-esr-115-unwrapped {
-    nameSuffix = "-esr";
-    desktopName = "Firefox ESR";
-    wmClass = "firefox-esr";
-    icon = "firefox-esr";
-  };
   firefox-esr = firefox-esr-128;
 
   firefox-bin-unwrapped = callPackage ../applications/networking/browsers/firefox-bin {