diff --git a/no-forced-sse.patch b/no-forced-sse.patch
new file mode 100644
index 0000000..d213e69
--- /dev/null
+++ b/no-forced-sse.patch
@@ -0,0 +1,37 @@
+From: Jan Engelhardt <jengelh@inai.de>
+Date: 2020-01-30 14:15:51.612533365 +0100
+
+cmake tests whether the compiler can emit SSE, which is the wrongest of all
+options. (At the very least, a build system would check the buildhost's actual
+CPU feature set; while not great, there are convincable usecases for doing
+that.)
+
+Disable unconditional emission of -msse2 into the command line.
+On x86_64 where SSE2 is always available, gcc already implies -msse2
+anyway, so there should not be anything lost by removing this block
+of makefilery.
+
+---
+ Source/cmake/WebKitCompilerFlags.cmake |    9 ---------
+ 1 file changed, 9 deletions(-)
+
+Index: webkitgtk-2.26.3/Source/cmake/WebKitCompilerFlags.cmake
+===================================================================
+--- webkitgtk-2.26.3.orig/Source/cmake/WebKitCompilerFlags.cmake
++++ webkitgtk-2.26.3/Source/cmake/WebKitCompilerFlags.cmake
+@@ -137,15 +137,6 @@ if (COMPILER_IS_GCC_OR_CLANG)
+     if (CMAKE_COMPILER_IS_GNUCXX)
+         WEBKIT_PREPEND_GLOBAL_COMPILER_FLAGS(-Wno-expansion-to-defined)
+     endif ()
+-
+-    # Force SSE2 fp on x86 builds.
+-    if (WTF_CPU_X86 AND NOT CMAKE_CROSSCOMPILING)
+-        WEBKIT_PREPEND_GLOBAL_COMPILER_FLAGS(-msse2 -mfpmath=sse)
+-        include(DetectSSE2)
+-        if (NOT SSE2_SUPPORT_FOUND)
+-            message(FATAL_ERROR "SSE2 support is required to compile WebKit")
+-        endif ()
+-    endif ()
+ endif ()
+ 
+ if (COMPILER_IS_GCC_OR_CLANG AND NOT MSVC)
diff --git a/webkit2gtk3.changes b/webkit2gtk3.changes
index 4d5eebe..b3739c1 100644
--- a/webkit2gtk3.changes
+++ b/webkit2gtk3.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Thu Aug  6 08:22:08 UTC 2020 - Jan Engelhardt <jengelh@inai.de>
+
+- Add no-forced-sse.patch, cure execution of illegal instruction
+  in i586 firefox.
+
 -------------------------------------------------------------------
 Wed Jul 29 15:18:24 UTC 2020 - Michael Gorse <mgorse@suse.com>
 
diff --git a/webkit2gtk3.spec b/webkit2gtk3.spec
index d350be6..a27564d 100644
--- a/webkit2gtk3.spec
+++ b/webkit2gtk3.spec
@@ -45,6 +45,8 @@ Source99:       webkit2gtk3.keyring
 Patch0:         webkit2gtk3-fdo-soname.patch
 # PATCH-FIX-OPENSUSE webkit-process.patch boo#1159329 mgorse@suse.com -- use single web process for evolution and geary.
 Patch1:         webkit-process.patch
+# PATCH-FIX-OPENSUSE no-forced-sse.patch jengelh@iani.de -- cure execution of illegal instruction in i586 firefox.
+Patch2:         no-forced-sse.patch
 
 BuildRequires:  Mesa-libEGL-devel
 BuildRequires:  Mesa-libGL-devel
@@ -274,6 +276,7 @@ A small test browswer from webkit, useful for testing features.
 %if 0%{?suse_version} <= 1500 && 0%{?sle_version} < 150200
 %patch1 -p1
 %endif
+%patch2 -p1
 
 %build
 %define _lto_cflags %{nil}