diff --git a/pkgs/applications/networking/browsers/firefox-2/default.nix b/pkgs/applications/networking/browsers/firefox-2/default.nix
index 31da6ea2b465..e557743aacad 100644
--- a/pkgs/applications/networking/browsers/firefox-2/default.nix
+++ b/pkgs/applications/networking/browsers/firefox-2/default.nix
@@ -10,12 +10,12 @@
 }:
 
 stdenv.mkDerivation {
-  name = "firefox-2.0.0.17";
+  name = "firefox-2.0.0.20";
 
   builder = ./builder.sh;
   src = fetchurl {
-    url = http://releases.mozilla.org/pub/mozilla.org/firefox/releases/2.0.0.17/source/firefox-2.0.0.17-source.tar.bz2;
-    sha1 = "ba95d9f64f2307b109dbce25d7a17af7e68298ed";
+    url = http://releases.mozilla.org/pub/mozilla.org/firefox/releases/2.0.0.20/source/firefox-2.0.0.20-source.tar.bz2;
+    sha1 = "16601fdbbb0a83b85fd053e76350f7da397f525e";
   };
 
   buildInputs = [
diff --git a/pkgs/applications/networking/browsers/firefox-3/default.nix b/pkgs/applications/networking/browsers/firefox-3/default.nix
index 29a331ca6968..4c89505bb94d 100644
--- a/pkgs/applications/networking/browsers/firefox-3/default.nix
+++ b/pkgs/applications/networking/browsers/firefox-3/default.nix
@@ -14,6 +14,7 @@ stdenv.mkDerivation {
   name = "firefox-3.0.5";
 
   src = fetchurl {
+    # Don't forget to update xulrunner.nix as well!
     url = http://releases.mozilla.org/pub/mozilla.org/firefox/releases/3.0.5/source/firefox-3.0.5-source.tar.bz2;
     sha1 = "f934e073efaad3d4dde847c8491fa9529564d5d2";
   };
diff --git a/pkgs/applications/networking/browsers/firefox-3/xulrunner.nix b/pkgs/applications/networking/browsers/firefox-3/xulrunner.nix
index 09798ce02ddc..5dede1b723f8 100644
--- a/pkgs/applications/networking/browsers/firefox-3/xulrunner.nix
+++ b/pkgs/applications/networking/browsers/firefox-3/xulrunner.nix
@@ -11,7 +11,7 @@
 
 let
 
-  version = "1.9.0.4"; # this attribute is used by other packages
+  version = "1.9.0.5"; # this attribute is used by other packages
 
 in  
 
@@ -19,8 +19,8 @@ stdenv.mkDerivation {
   name = "xulrunner-${version}";
 
   src = fetchurl {
-    url = http://releases.mozilla.org/pub/mozilla.org/firefox/releases/3.0.4/source/firefox-3.0.4-source.tar.bz2;
-    sha1 = "16715b4af7ca2bad6baa8d450a3fd9cb375ad6d6";
+    url = http://releases.mozilla.org/pub/mozilla.org/firefox/releases/3.0.5/source/firefox-3.0.5-source.tar.bz2;
+    sha1 = "f934e073efaad3d4dde847c8491fa9529564d5d2";
   };
 
   buildInputs = [
diff --git a/pkgs/applications/networking/mailreaders/thunderbird-2.x/default.nix b/pkgs/applications/networking/mailreaders/thunderbird-2.x/default.nix
index 6f052936c13b..db051fc026f9 100644
--- a/pkgs/applications/networking/mailreaders/thunderbird-2.x/default.nix
+++ b/pkgs/applications/networking/mailreaders/thunderbird-2.x/default.nix
@@ -11,13 +11,13 @@
 }:
 
 stdenv.mkDerivation {
-  name = "thunderbird-2.0.0.18";
+  name = "thunderbird-2.0.0.19";
 
   builder = ./builder.sh;
   
   src = fetchurl {
-    url = ftp://ftp.mozilla.org/pub/mozilla.org/thunderbird/releases/2.0.0.18/source/thunderbird-2.0.0.18-source.tar.bz2;
-    sha1 = "4d05300280763e34c7a115835523ed2805f7733c";
+    url = ftp://ftp.mozilla.org/pub/mozilla.org/thunderbird/releases/2.0.0.19/source/thunderbird-2.0.0.19-source.tar.bz2;
+    sha1 = "4d2e0f8b405bb0ceab20a9f570ce91cf4640f456";
   };
 
   buildInputs = [