diff --git a/nixos/tests/all-tests.nix b/nixos/tests/all-tests.nix
index 0037fb189366..d674d0cdba37 100644
--- a/nixos/tests/all-tests.nix
+++ b/nixos/tests/all-tests.nix
@@ -275,7 +275,6 @@ in {
   firefox-beta = handleTest ./firefox.nix { firefoxPackage = pkgs.firefox-beta; };
   firefox-devedition = handleTest ./firefox.nix { firefoxPackage = pkgs.firefox-devedition; };
   firefox-esr    = handleTest ./firefox.nix { firefoxPackage = pkgs.firefox-esr; }; # used in `tested` job
-  firefox-esr-102 = handleTest ./firefox.nix { firefoxPackage = pkgs.firefox-esr-102; };
   firefox-esr-115 = handleTest ./firefox.nix { firefoxPackage = pkgs.firefox-esr-115; };
   firejail = handleTest ./firejail.nix {};
   firewall = handleTest ./firewall.nix { nftables = false; };
diff --git a/pkgs/applications/networking/browsers/firefox/packages.nix b/pkgs/applications/networking/browsers/firefox/packages.nix
index a98fbd99642b..fe403a8396ea 100644
--- a/pkgs/applications/networking/browsers/firefox/packages.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages.nix
@@ -88,35 +88,6 @@
     env.MOZ_REQUIRE_SIGNING = "";
   });
 
-  firefox-esr-102 = buildMozillaMach rec {
-    pname = "firefox-esr-102";
-    version = "102.15.0esr";
-    applicationName = "Mozilla Firefox ESR";
-    src = fetchurl {
-      url = "mirror://mozilla/firefox/releases/${version}/source/firefox-${version}.source.tar.xz";
-      sha512 = "87db6e32fda215253f9b3bd233ef7fa91a64349310064b8482e5c634f34cbe99a2a111d74d2b9f2a99a0b3b510dbf9039ebe4ccfc176c2554d65bc9cfb508bf9";
-    };
-
-    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-102 ];
-    updateScript = callPackage ./update.nix {
-      attrPath = "firefox-esr-102-unwrapped";
-      versionPrefix = "102";
-      versionSuffix = "esr";
-    };
-  };
-
   firefox-esr-115 = buildMozillaMach rec {
     pname = "firefox-esr-115";
     version = "115.2.0esr";
diff --git a/pkgs/development/libraries/nspr/default.nix b/pkgs/development/libraries/nspr/default.nix
index 7d8877c79ad1..59a3b4975793 100644
--- a/pkgs/development/libraries/nspr/default.nix
+++ b/pkgs/development/libraries/nspr/default.nix
@@ -46,7 +46,7 @@ stdenv.mkDerivation rec {
   enableParallelBuilding = true;
 
   passthru.tests = {
-    inherit (nixosTests) firefox firefox-esr-102 firefox-esr-115;
+    inherit (nixosTests) firefox firefox-esr-115;
   };
 
   meta = with lib; {
diff --git a/pkgs/development/libraries/nss/generic.nix b/pkgs/development/libraries/nss/generic.nix
index 8badbf9e8760..592dbffbdffc 100644
--- a/pkgs/development/libraries/nss/generic.nix
+++ b/pkgs/development/libraries/nss/generic.nix
@@ -182,9 +182,9 @@ stdenv.mkDerivation rec {
   passthru.updateScript = ./update.sh;
 
   passthru.tests = lib.optionalAttrs (lib.versionOlder version nss_latest.version) {
-    inherit (nixosTests) firefox-esr-102;
+    inherit (nixosTests) firefox-esr-115;
   } // lib.optionalAttrs (lib.versionAtLeast version nss_latest.version) {
-    inherit (nixosTests) firefox firefox-esr-115;
+    inherit (nixosTests) firefox;
   };
 
   meta = with lib; {
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 900277fc29fb..d3ea833d6bc8 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -32066,7 +32066,6 @@ with pkgs;
   firefox-unwrapped = firefoxPackages.firefox;
   firefox-beta-unwrapped = firefoxPackages.firefox-beta;
   firefox-devedition-unwrapped = firefoxPackages.firefox-devedition;
-  firefox-esr-102-unwrapped = firefoxPackages.firefox-esr-102;
   firefox-esr-115-unwrapped = firefoxPackages.firefox-esr-115;
   firefox-esr-unwrapped = firefoxPackages.firefox-esr-115;
 
@@ -32077,7 +32076,6 @@ with pkgs;
   firefox-mobile = callPackage ../applications/networking/browsers/firefox/mobile-config.nix { };
 
   firefox-esr = firefox-esr-115;
-  firefox-esr-102 = wrapFirefox firefox-esr-102-unwrapped { };
   firefox-esr-115 = wrapFirefox firefox-esr-115-unwrapped { };
 
   firefox-bin-unwrapped = callPackage ../applications/networking/browsers/firefox-bin {