diff --git a/pkgs/applications/networking/browsers/firefox-3/default.nix b/pkgs/applications/networking/browsers/firefox-3/default.nix
index 91ab844c0bb..47a01327740 100644
--- a/pkgs/applications/networking/browsers/firefox-3/default.nix
+++ b/pkgs/applications/networking/browsers/firefox-3/default.nix
@@ -33,7 +33,7 @@ stdenv.mkDerivation {
     "--with-system-zlib"
     "--with-system-bz2"
     # "--with-system-png" # <-- "--with-system-png won't work because the system's libpng doesn't have APNG support"
-    "--enable-system-cairo" # <-- disabled for now because Firefox needs a alpha version of Cairo
+    "--enable-system-cairo"
     #"--enable-system-sqlite" # <-- this seems to be discouraged
     "--disable-crashreporter"
   ];
diff --git a/pkgs/applications/networking/browsers/firefox-3/xulrunner.nix b/pkgs/applications/networking/browsers/firefox-3/xulrunner.nix
index d8d212e6808..e75b40ff780 100644
--- a/pkgs/applications/networking/browsers/firefox-3/xulrunner.nix
+++ b/pkgs/applications/networking/browsers/firefox-3/xulrunner.nix
@@ -34,7 +34,7 @@ stdenv.mkDerivation {
     "--with-system-zlib"
     "--with-system-bz2"
     # "--with-system-png" # <-- "--with-system-png won't work because the system's libpng doesn't have APNG support"
-    "--enable-system-cairo" # <-- disabled for now because Firefox needs a alpha version of Cairo
+    "--enable-system-cairo"
     #"--enable-system-sqlite" # <-- this seems to be discouraged
     "--disable-crashreporter"
   ];