diff --git a/browser_patches/firefox-beta/BUILD_NUMBER b/browser_patches/firefox-beta/BUILD_NUMBER
index 9eec5ba879..b6838ab9fc 100644
--- a/browser_patches/firefox-beta/BUILD_NUMBER
+++ b/browser_patches/firefox-beta/BUILD_NUMBER
@@ -1,2 +1,2 @@
-1314
-Changed: lushnikov@chromium.org Sat Jan  8 18:49:01 MSK 2022
+1315
+Changed: ross.wollman@gmail.com Wed Jan 19 09:15:42 PST 2022
diff --git a/browser_patches/firefox-beta/juggler/NetworkObserver.js b/browser_patches/firefox-beta/juggler/NetworkObserver.js
index 57c477b105..f7e7659f8d 100644
--- a/browser_patches/firefox-beta/juggler/NetworkObserver.js
+++ b/browser_patches/firefox-beta/juggler/NetworkObserver.js
@@ -250,7 +250,7 @@ class NetworkRequest {
     }
     if (method)
       this.httpChannel.requestMethod = method;
-    if (postData)
+    if (postData !== undefined)
       setPostData(this.httpChannel, postData, headers);
   }
 
diff --git a/browser_patches/firefox/BUILD_NUMBER b/browser_patches/firefox/BUILD_NUMBER
index 2a6be2acf9..389e26693f 100644
--- a/browser_patches/firefox/BUILD_NUMBER
+++ b/browser_patches/firefox/BUILD_NUMBER
@@ -1,2 +1,2 @@
-1314
-Changed: lushnikov@chromium.org Tue 18 Jan 2022 02:42:08 AM PST
+1315
+Changed: ross.wollman@gmail.com Tue Jan 18 21:20:13 PST 2022
diff --git a/browser_patches/firefox/juggler/NetworkObserver.js b/browser_patches/firefox/juggler/NetworkObserver.js
index 57c477b105..f7e7659f8d 100644
--- a/browser_patches/firefox/juggler/NetworkObserver.js
+++ b/browser_patches/firefox/juggler/NetworkObserver.js
@@ -250,7 +250,7 @@ class NetworkRequest {
     }
     if (method)
       this.httpChannel.requestMethod = method;
-    if (postData)
+    if (postData !== undefined)
       setPostData(this.httpChannel, postData, headers);
   }