diff --git a/pkgs/applications/networking/browsers/firefox/packages/firefox-esr-140.nix b/pkgs/applications/networking/browsers/firefox/packages/firefox-esr-140.nix
index 7c35569b2157..a87bad25a601 100644
--- a/pkgs/applications/networking/browsers/firefox/packages/firefox-esr-140.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages/firefox-esr-140.nix
@@ -24,12 +24,18 @@ buildMozillaMach rec {
     maxSilent = 14400; # 4h, double the default of 7200s (c.f. #129212, #129115)
     license = lib.licenses.mpl20;
     mainProgram = "firefox";
-    identifiers.cpeParts = {
-      product = "firefox";
-      sw_edition = "esr";
-      update = "*";
-      vendor = "mozilla";
-      version = lib.removeSuffix "esr" version;
+    identifiers = {
+      cpeParts = {
+        product = "firefox";
+        sw_edition = "esr";
+        update = "*";
+        vendor = "mozilla";
+        version = lib.removeSuffix "esr" version;
+      };
+      purlParts = {
+        type = "generic";
+        spec = "firefox@${lib.removeSuffix "esr" version}";
+      };
     };
   };
   tests = {
diff --git a/pkgs/applications/networking/browsers/firefox/packages/firefox-esr-153.nix b/pkgs/applications/networking/browsers/firefox/packages/firefox-esr-153.nix
index b7fbd0eb2148..c59d80099bb6 100644
--- a/pkgs/applications/networking/browsers/firefox/packages/firefox-esr-153.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages/firefox-esr-153.nix
@@ -25,12 +25,18 @@ buildMozillaMach rec {
     maxSilent = 14400; # 4h, double the default of 7200s (c.f. #129212, #129115)
     license = lib.licenses.mpl20;
     mainProgram = "firefox";
-    identifiers.cpeParts = {
-      product = "firefox";
-      sw_edition = "esr";
-      update = "*";
-      vendor = "mozilla";
-      version = lib.removeSuffix "esr" version;
+    identifiers = {
+      cpeParts = {
+        product = "firefox";
+        sw_edition = "esr";
+        update = "*";
+        vendor = "mozilla";
+        version = lib.removeSuffix "esr" version;
+      };
+      purlParts = {
+        type = "generic";
+        spec = "firefox@${lib.removeSuffix "esr" version}";
+      };
     };
   };
   tests = {
diff --git a/pkgs/applications/networking/browsers/firefox/packages/firefox.nix b/pkgs/applications/networking/browsers/firefox/packages/firefox.nix
index 8c9ade933b46..df8211d5f9bb 100644
--- a/pkgs/applications/networking/browsers/firefox/packages/firefox.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages/firefox.nix
@@ -30,11 +30,17 @@ buildMozillaMach rec {
     maxSilent = 14400; # 4h, double the default of 7200s (c.f. #129212, #129115)
     license = lib.licenses.mpl20;
     mainProgram = "firefox";
-    identifiers.cpeParts = {
-      inherit version;
-      product = "firefox";
-      update = "*";
-      vendor = "mozilla";
+    identifiers = {
+      cpeParts = {
+        inherit version;
+        product = "firefox";
+        update = "*";
+        vendor = "mozilla";
+      };
+      purlParts = {
+        type = "generic";
+        spec = "firefox@${version}";
+      };
     };
   };
   tests = {