diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index f18d1115a54..547f74f931d 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -6911,7 +6911,7 @@ let
 
   firefoxWrapper = wrapFirefox { browser = pkgs.firefox; };
 
-  firefoxPkgs = pkgs.firefox12Pkgs;
+  firefoxPkgs = pkgs.firefox15Pkgs;
 
   firefox36Pkgs = callPackage ../applications/networking/browsers/firefox/3.6.nix {
     inherit (gnome) libIDL;
@@ -6925,12 +6925,6 @@ let
 
   firefox12Wrapper = wrapFirefox { browser = firefox12Pkgs.firefox; };
 
-  firefox13Pkgs = callPackage ../applications/networking/browsers/firefox/13.0.nix {
-    inherit (gnome) libIDL;
-  };
-
-  firefox13Wrapper = lowPrio (wrapFirefox { browser = firefox13Pkgs.firefox; });
-
   firefox15Pkgs = callPackage ../applications/networking/browsers/firefox/15.0.nix {
     inherit (gnome) libIDL;
     inherit (pythonPackages) pysqlite;
diff --git a/pkgs/top-level/release.nix b/pkgs/top-level/release.nix
index 3b0a015d6b4..0f8ea5574e3 100644
--- a/pkgs/top-level/release.nix
+++ b/pkgs/top-level/release.nix
@@ -359,7 +359,6 @@ with (import ./release-lib.nix);
 
   firefox36Pkgs.firefox = linux;
   firefox12Pkgs.firefox = linux;
-  firefox13Pkgs.firefox = linux;
   firefox15Pkgs.firefox = linux;
 
   gnome = {