diff --git a/pkgs/applications/networking/browsers/firefox/packages.nix b/pkgs/applications/networking/browsers/firefox/packages.nix
index 925374d38e8b..7a3fc9b9a078 100644
--- a/pkgs/applications/networking/browsers/firefox/packages.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages.nix
@@ -7,16 +7,16 @@ in
 rec {
   firefox = common rec {
     pname = "firefox";
-    ffversion = "86.0.1";
+    ffversion = "87.0";
     src = fetchurl {
       url = "mirror://mozilla/firefox/releases/${ffversion}/source/firefox-${ffversion}.source.tar.xz";
-      sha512 = "e613cdcadfd71a01800a72c08c590032605ca8a8a0ba93326ffba93c2819f629fd620c23d00ca1274b203adc20acfe5d7913fee240ff14819fb1377ed08b1214";
+      sha512 = "c1c08be2283e7a162c8be2f2647ec2bb85cab592738dc45e4b4ffb72969229cc0019a30782a4cb27f09a13b088c63841071dd202b3543dfba295140a7d6246a4";
     };
 
     meta = {
       description = "A web browser built from Firefox source tree";
       homepage = "http://www.mozilla.com/en-US/firefox/";
-      maintainers = with lib.maintainers; [ eelco lovesegfault ];
+      maintainers = with lib.maintainers; [ eelco lovesegfault 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".
@@ -32,16 +32,16 @@ rec {
 
   firefox-esr-78 = common rec {
     pname = "firefox-esr";
-    ffversion = "78.8.0esr";
+    ffversion = "78.9.0esr";
     src = fetchurl {
       url = "mirror://mozilla/firefox/releases/${ffversion}/source/firefox-${ffversion}.source.tar.xz";
-      sha512 = "0160aa6c408c2af66d24b74cf98e1a07ab1604e7b93ffcde79201f9d68e41e896ef965f1904de52d5dd82ffedae33ac96e93b871727bf5dd5983c5af2f1f439f";
+      sha512 = "28582fc0a03fb50c0a817deb1083817bb7f2f5d38e98439bf655ed4ee18c83568b3002a59ef76edf357bfb11f55832a221d14130f116aac19d850768fba3ac8b";
     };
 
     meta = {
       description = "A web browser built from Firefox Extended Support Release source tree";
       homepage = "http://www.mozilla.com/en-US/firefox/";
-      maintainers = with lib.maintainers; [ eelco ];
+      maintainers = with lib.maintainers; [ eelco 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".