diff --git a/modules/libpr0n/test/reftest/generic/check-header.sjs b/modules/libpr0n/test/reftest/generic/check-header.sjs
index a5e9964fd97..ceefbbe65f2 100644
--- a/modules/libpr0n/test/reftest/generic/check-header.sjs
+++ b/modules/libpr0n/test/reftest/generic/check-header.sjs
@@ -50,8 +50,8 @@ const IMAGE_DATA =
 
 function handleRequest(request, response)
 {
-  response.setHeader("Content-Type", "text/plain");
-  response.setHeader("Cache-Control", "no-cache");
+  response.setHeader("Content-Type", "text/plain", false);
+  response.setHeader("Cache-Control", "no-cache", false);
 
   var accept = request.hasHeader("Accept")
              ? request.getHeader("Accept")
diff --git a/netwerk/test/httpserver/test/test_basic_functionality.js b/netwerk/test/httpserver/test/test_basic_functionality.js
index e6b95d738f7..8cb8afac86b 100644
--- a/netwerk/test/httpserver/test/test_basic_functionality.js
+++ b/netwerk/test/httpserver/test/test_basic_functionality.js
@@ -190,7 +190,7 @@ var objHandler =
 function functionHandler(metadata, response)
 {
   response.setStatusLine("1.1", 404, "Page Not Found");
-  response.setHeader("foopy", "quux-baz");
+  response.setHeader("foopy", "quux-baz", false);
 
   do_check_eq(metadata.port, 4444);
   do_check_eq(metadata.host, "localhost");
diff --git a/netwerk/test/httpserver/test/test_headers.js b/netwerk/test/httpserver/test/test_headers.js
index 167f47a8bc5..f2299da4a80 100644
--- a/netwerk/test/httpserver/test/test_headers.js
+++ b/netwerk/test/httpserver/test/test_headers.js
@@ -200,12 +200,12 @@ function testHasHeader()
 {
   var headers = new nsHttpHeaders();
 
-  headers.setHeader("foo", "bar");
+  headers.setHeader("foo", "bar", false);
   do_check_true(headers.hasHeader("foo"));
   do_check_true(headers.hasHeader("fOo"));
   do_check_false(headers.hasHeader("not-there"));
 
-  headers.setHeader("f`'~", "bar");
+  headers.setHeader("f`'~", "bar", false);
   do_check_true(headers.hasHeader("F`'~"));
 
   try
diff --git a/netwerk/test/httpserver/test/test_registerdirectory.js b/netwerk/test/httpserver/test/test_registerdirectory.js
index cba23cc9ca7..dd99f5a3cff 100644
--- a/netwerk/test/httpserver/test/test_registerdirectory.js
+++ b/netwerk/test/httpserver/test/test_registerdirectory.js
@@ -300,7 +300,7 @@ function run_test()
 function override_test_registerdirectory(metadata, response)
 {
   response.setStatusLine("1.1", 200, "OK");
-  response.setHeader("Override-Succeeded", "yes");
+  response.setHeader("Override-Succeeded", "yes", false);
 
   var body = "success!";
   response.bodyOutputStream.write(body, body.length);
diff --git a/netwerk/test/unit/test_authentication.js b/netwerk/test/unit/test_authentication.js
index 759517e058c..5eb1b999694 100644
--- a/netwerk/test/unit/test_authentication.js
+++ b/netwerk/test/unit/test_authentication.js
@@ -424,7 +424,7 @@ function authHandler(metadata, response) {
 // /auth/ntlm/simple
 function authNtlmSimple(metadata, response) {
   response.setStatusLine(metadata.httpVersion, 401, "Unauthorized");
-  response.setHeader("WWW-Authenticate", "NTLM" /* + ' realm="secret"' */);
+  response.setHeader("WWW-Authenticate", "NTLM" /* + ' realm="secret"' */, false);
 
   var body = "NOTE: This just sends an NTLM challenge, it never\n" +
              "accepts the authentication. It also closes\n" +
diff --git a/netwerk/test/unit/test_plaintext_sniff.js b/netwerk/test/unit/test_plaintext_sniff.js
index c705cc317a3..56dfc50ef99 100644
--- a/netwerk/test/unit/test_plaintext_sniff.js
+++ b/netwerk/test/unit/test_plaintext_sniff.js
@@ -154,7 +154,7 @@ function doTest(headerIdx, bodyIdx) {
 }
 
 function createResponse(headerIdx, bodyIdx, metadata, response) {
-  response.setHeader("Content-Type", contentTypeHeaderList[headerIdx][0]);
+  response.setHeader("Content-Type", contentTypeHeaderList[headerIdx][0], false);
   response.bodyOutputStream.write(bodyList[bodyIdx][0],
                                   bodyList[bodyIdx][0].length);
 }
diff --git a/netwerk/test/unit/test_resumable_channel.js b/netwerk/test/unit/test_resumable_channel.js
index 4d43f8c2241..9446b924597 100644
--- a/netwerk/test/unit/test_resumable_channel.js
+++ b/netwerk/test/unit/test_resumable_channel.js
@@ -258,13 +258,13 @@ function rangeHandler(metadata, response) {
     var to = (matches[2] === undefined) ? rangeBody.length - 1 : matches[2];
     if (from >= rangeBody.length) {
       response.setStatusLine(metadata.httpVersion, 416, "Start pos too high");
-      response.setHeader("Content-Range", "*/" + rangeBody.length);
+      response.setHeader("Content-Range", "*/" + rangeBody.length, false);
       return;
     }
     body = body.substring(from, to + 1);
     // always respond to successful range requests with 206
     response.setStatusLine(metadata.httpVersion, 206, "Partial Content");
-    response.setHeader("Content-Range", from + "-" + to + "/" + rangeBody.length);
+    response.setHeader("Content-Range", from + "-" + to + "/" + rangeBody.length, false);
   }
 
   response.bodyOutputStream.write(body, body.length);
@@ -274,7 +274,7 @@ function rangeHandler(metadata, response) {
 function redirHandler(metadata, response) {
   response.setStatusLine(metadata.httpVersion, 302, "Found");
   response.setHeader("Content-Type", "text/html", false);
-  response.setHeader("Location", metadata.getHeader("X-Redir-To"));
+  response.setHeader("Location", metadata.getHeader("X-Redir-To"), false);
   var body = "redirect\r\n";
   response.bodyOutputStream.write(body, body.length);
 }
diff --git a/testing/mochitest/server.js b/testing/mochitest/server.js
index 54cf4ef928a..b335320b2a2 100644
--- a/testing/mochitest/server.js
+++ b/testing/mochitest/server.js
@@ -191,7 +191,7 @@ function runServer()
 function serverShutdown(metadata, response)
 {
   response.setStatusLine("1.1", 200, "OK");
-  response.setHeader("Content-type", "text/plain");
+  response.setHeader("Content-type", "text/plain", false);
 
   var body = "Server shut down.";
   response.bodyOutputStream.write(body, body.length);
@@ -203,7 +203,7 @@ function serverShutdown(metadata, response)
 function redirect(metadata, response)
 {
   response.setStatusLine("1.1", 301, "Moved Permanently");
-  response.setHeader("Location", metadata.queryString);
+  response.setHeader("Location", metadata.queryString, false);
 }
 
 //
@@ -475,7 +475,7 @@ function testListing(metadata, response)
 function defaultDirHandler(metadata, response)
 {
   response.setStatusLine("1.1", 200, "OK");
-  response.setHeader("Content-type", "text/html");
+  response.setHeader("Content-type", "text/html", false);
   try {
     if (metadata.path.indexOf("/tests") != 0) {
       regularListing(metadata, response);
diff --git a/toolkit/components/downloads/test/unit/test_resume.js b/toolkit/components/downloads/test/unit/test_resume.js
index 09a8ca0470e..6b9a51202d7 100644
--- a/toolkit/components/downloads/test/unit/test_resume.js
+++ b/toolkit/components/downloads/test/unit/test_resume.js
@@ -76,13 +76,13 @@ function run_test()
       var to = (matches[2] === undefined) ? data.length - 1 : matches[2];
       if (from >= data.length) {
         resp.setStatusLine(meta.httpVersion, 416, "Start pos too high");
-        resp.setHeader("Content-Range", "*/" + data.length);
+        resp.setHeader("Content-Range", "*/" + data.length, false);
         return;
       }
       body = body.substring(from, to + 1);
       // always respond to successful range requests with 206
       resp.setStatusLine(meta.httpVersion, 206, "Partial Content");
-      resp.setHeader("Content-Range", from + "-" + to + "/" + data.length);
+      resp.setHeader("Content-Range", from + "-" + to + "/" + data.length, false);
     }
     resp.bodyOutputStream.write(body, body.length);
   });