diff --git a/.firefox.metadata b/.firefox.metadata
index a78cc46..6b0da91 100644
--- a/.firefox.metadata
+++ b/.firefox.metadata
@@ -1,6 +1,6 @@
 5012b69e54cbebe3b5e74011dacf3a2097f49921 SOURCES/cbindgen-vendor.tar.xz
-271e087aaa09420f7ae42972e7c5375b2a9c1bb5 SOURCES/firefox-128.9.0esr.b2.processed-source.tar.xz
-2d4e4bfa9731134056380841228ad4a44a2ba3ac SOURCES/firefox-langpacks-128.9.0esr-20250331.tar.xz
+11fa2914eeacd6f489a0cd232d9d7197e89f8df0 SOURCES/firefox-128.10.0esr.processed-source.tar.xz
+0b5a3c7e89424e37ad84c57377342782b06f5dfb SOURCES/firefox-langpacks-128.10.0esr-20250422.tar.xz
 2d8a6b2b30d5496735f49ffe8c8a7ede3a78a5ca SOURCES/mochitest-python.tar.gz
 d744f92e874688cc4b5376477dfdd639a97a6cd4 SOURCES/nspr-4.35.0-1.el8_1.src.rpm
 f466d7213e85773e002c48897524eaf909480046 SOURCES/nss-3.101.0-7.el8_2.src.rpm
diff --git a/.gitignore b/.gitignore
index 617172f..d98210b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,6 @@
 SOURCES/cbindgen-vendor.tar.xz
-SOURCES/firefox-128.9.0esr.b2.processed-source.tar.xz
-SOURCES/firefox-langpacks-128.9.0esr-20250331.tar.xz
+SOURCES/firefox-128.10.0esr.processed-source.tar.xz
+SOURCES/firefox-langpacks-128.10.0esr-20250422.tar.xz
 SOURCES/mochitest-python.tar.gz
 SOURCES/nspr-4.35.0-1.el8_1.src.rpm
 SOURCES/nss-3.101.0-7.el8_2.src.rpm
diff --git a/SPECS/firefox.spec b/SPECS/firefox.spec
index 825a70e..151eb46 100644
--- a/SPECS/firefox.spec
+++ b/SPECS/firefox.spec
@@ -40,7 +40,7 @@ function dist_to_rhel_minor(str, start)
   end
   match = string.match(str, ".el9")
   if match then
-     return 6
+     return 7
   end
   match = string.match(str, ".el10_%d+")
   if match then
@@ -48,7 +48,7 @@ function dist_to_rhel_minor(str, start)
   end
   match = string.match(str, ".el10")
   if match then
-     return 0
+     return 1
   end
   return -1
 end}
@@ -118,7 +118,7 @@ end}
 
 %if 0%{?rhel} > 7 && 0%{?rhel} < 10
   %global use_gcc_ts      1
-  %if 0%{?rhel} == 9 && %{rhel_minor_version} >= 6
+  %if (0%{?rhel} == 9 && %{rhel_minor_version} >= 6) || (0%{?rhel} == 8 && %{rhel_minor_version} >= 10)
     # clang depends on gcc-toolset-14-gcc-c++
     %global gts_version 14
   %else
@@ -156,7 +156,7 @@ end}
 # If set to .b2 or .b3 ... the processed source file needs to be renamed before upload, e.g.
 # firefox-102.8.0esr.b2.processed-source.tar.xz
 # When unset use processed source file name as is.
-%global buildnum .b2
+#%%global buildnum .b2
 
 %bcond_without langpacks
 
@@ -166,8 +166,8 @@ end}
 
 Summary:        Mozilla Firefox Web browser
 Name:           firefox
-Version:        128.9.0
-Release:        2%{?dist}
+Version:        128.10.0
+Release:        1%{?dist}
 URL:            https://www.mozilla.org/firefox/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 
@@ -197,7 +197,7 @@ ExcludeArch:    aarch64 s390 ppc
 # Link to original tarball: https://archive.mozilla.org/pub/firefox/releases/%%{version}%%{?pre_version}/source/firefox-%%{version}%%{?pre_version}.source.tar.xz
 Source0:        firefox-%{version}%{?pre_version}%{?buildnum}.processed-source.tar.xz
 %if %{with langpacks}
-Source1:        firefox-langpacks-%{version}%{?pre_version}-20250331.tar.xz
+Source1:        firefox-langpacks-%{version}%{?pre_version}-20250422.tar.xz
 %endif
 Source2:        cbindgen-vendor.tar.xz
 Source3:        process-official-tarball
@@ -483,8 +483,9 @@ BuildRequires: gcc-toolset-%{gts_version}-runtime
 BuildRequires: gcc-toolset-%{gts_version}-binutils
 BuildRequires: gcc-toolset-%{gts_version}-gcc
 BuildRequires: gcc-toolset-%{gts_version}-gcc-plugin-annobin
-# Do not explicitly require gcc-toolset-%{gts_version}-gcc-g++ instead fail
+# Do not explicitly require gcc-toolset-%%{gts_version}-gcc-c++ instead fail
 # when clang is upgraded to depend on a later toolset and adjust version.
+# ERROR: The target C compiler is version 13.3.1, while the target C++ compiler is version 8.5.0. Need to use the same compiler version.
 %endif
 
 Requires:       mozilla-filesystem
@@ -1966,7 +1967,7 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 %{mozappdir}/fonts/TwemojiMozilla.ttf
 %{mozappdir}/glxtest
 %{mozappdir}/vaapitest
-%ifarch aarch64
+%ifarch aarch64 riscv64
 %{mozappdir}/v4l2test
 %endif
 
@@ -1988,6 +1989,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #---------------------------------------------------------------------
 
 %changelog
+* Tue Apr 22 2025 Eike Rathke <erack@redhat.com> - 128.10.0-1
+- Update to 128.10.0 build1
+
 * Mon Mar 31 2025 Eike Rathke <erack@redhat.com> - 128.9.0-2
 - Update to 128.9.0 build2