diff --git a/srcpkgs/firefox/patches/fix-stack-overflow.patch b/srcpkgs/firefox/patches/fix-stack-overflow.patch
new file mode 100644
index 00000000000..9c94956d75d
--- /dev/null
+++ b/srcpkgs/firefox/patches/fix-stack-overflow.patch
@@ -0,0 +1,43 @@
+https://bugs.alpinelinux.org/issues/5559
+https://bugzilla.mozilla.org/show_bug.cgi?id=1274732
+
+--- netwerk/streamconv/converters/nsHTTPCompressConv.cpp
++++ netwerk/streamconv/converters/nsHTTPCompressConv.cpp
+@@ -165,9 +165,8 @@ nsHTTPCompressConv::BrotliHandler(nsIInputStream *stream, void *closure, const c
+   nsHTTPCompressConv *self = static_cast<nsHTTPCompressConv *>(closure);
+   *countRead = 0;
+ 
+-  const uint32_t kOutSize = 128 * 1024; // just a chunk size, we call in a loop
+-  unsigned char outBuffer[kOutSize];
+-  unsigned char *outPtr;
++  const size_t kOutSize = 128 * 1024; // just a chunk size, we call in a loop
++  uint8_t *outPtr;
+   size_t outSize;
+   size_t avail = aAvail;
+   BrotliResult res;
+@@ -177,9 +176,15 @@ nsHTTPCompressConv::BrotliHandler(nsIInputStream *stream, void *closure, const c
+     return NS_OK;
+   }
+ 
++  auto outBuffer = MakeUniqueFallible<uint8_t[]>(kOutSize);
++  if (outBuffer == nullptr) {
++    self->mBrotli->mStatus = NS_ERROR_OUT_OF_MEMORY;
++    return self->mBrotli->mStatus;
++  }
++
+   do {
+     outSize = kOutSize;
+-    outPtr = outBuffer;
++    outPtr = outBuffer.get();
+ 
+     // brotli api is documented in brotli/dec/decode.h and brotli/dec/decode.c
+     LOG(("nsHttpCompresssConv %p brotlihandler decompress %d\n", self, avail));
+@@ -210,7 +215,7 @@ nsHTTPCompressConv::BrotliHandler(nsIInputStream *stream, void *closure, const c
+       nsresult rv = self->do_OnDataAvailable(self->mBrotli->mRequest,
+                                              self->mBrotli->mContext,
+                                              self->mBrotli->mSourceOffset,
+-                                             reinterpret_cast<const char *>(outBuffer),
++                                             reinterpret_cast<const char *>(outBuffer.get()),
+                                              outSize);
+       LOG(("nsHttpCompressConv %p BrotliHandler ODA rv=%x", self, rv));
+       if (NS_FAILED(rv)) {
diff --git a/srcpkgs/firefox/template b/srcpkgs/firefox/template
index c0ea7510a3d..af3085b2bce 100644
--- a/srcpkgs/firefox/template
+++ b/srcpkgs/firefox/template
@@ -1,7 +1,7 @@
 # Template build file for 'firefox'.
 pkgname=firefox
 version=46.0.1
-revision=1
+revision=2
 short_desc="Lightweight gecko-based web browser"
 maintainer="Juan RP <xtraeme@voidlinux.eu>"
 homepage="https://www.mozilla.org/firefox/"