diff --git a/devtools/client/debugger/test/mochitest/browser_dbg_parser-03.js b/devtools/client/debugger/test/mochitest/browser_dbg_parser-03.js
index 39c253dd962c..439df705b4eb 100644
--- a/devtools/client/debugger/test/mochitest/browser_dbg_parser-03.js
+++ b/devtools/client/debugger/test/mochitest/browser_dbg_parser-03.js
@@ -19,7 +19,7 @@ function test() {
     "<script type='text/javascript'>",
     "let b = 42;",
     "</script>",
-    "<script type='text/javascript'>",
+    "<script type='text/javascript;version=1.8'>",
     "let c = 42;",
     "</script>",
     "</head>"
diff --git a/devtools/client/debugger/test/mochitest/browser_dbg_parser-05.js b/devtools/client/debugger/test/mochitest/browser_dbg_parser-05.js
index f65ba241a4b1..b34d3952a0de 100644
--- a/devtools/client/debugger/test/mochitest/browser_dbg_parser-05.js
+++ b/devtools/client/debugger/test/mochitest/browser_dbg_parser-05.js
@@ -19,7 +19,7 @@ function test() {
     "a.push('<script type=\"text/javascript\">');",
     "a.push('var b = 42;');",
     "a.push('</script>');",
-    "a.push('<script type=\"text/javascript\">');",
+    "a.push('<script type=\"text/javascript;version=1.8\">');",
     "a.push('var c = 42;');",
     "a.push('</script>');"
   ].join("\n");
diff --git a/devtools/client/debugger/test/mochitest/browser_dbg_parser-11.js b/devtools/client/debugger/test/mochitest/browser_dbg_parser-11.js
index d7f152c9c76b..ee2b4c89d32c 100644
--- a/devtools/client/debugger/test/mochitest/browser_dbg_parser-11.js
+++ b/devtools/client/debugger/test/mochitest/browser_dbg_parser-11.js
@@ -12,7 +12,7 @@ function test() {
 
   let source = [
     '<script type="text/javascript" src="chrome://foo.js"/>',
-    '<script type="application/javascript" src="chrome://baz.js"/>',
+    '<script type="application/javascript;version=1.8" src="chrome://baz.js"/>',
     '<script async defer src="chrome://foobar.js"/>',
     '<script type="application/javascript"/>"hello third"',
     '<script type="application/javascript">"hello fourth"</script>',
diff --git a/devtools/client/webconsole/test/test-bug-632347-iterators-generators.html b/devtools/client/webconsole/test/test-bug-632347-iterators-generators.html
index b4b959b00f0f..1eddcf350175 100644
--- a/devtools/client/webconsole/test/test-bug-632347-iterators-generators.html
+++ b/devtools/client/webconsole/test/test-bug-632347-iterators-generators.html
@@ -5,7 +5,7 @@
     <title>Web Console test for bug 632347 - iterators and generators</title>
     <!-- Any copyright is dedicated to the Public Domain.
          http://creativecommons.org/publicdomain/zero/1.0/ -->
-<script type="application/javascript">
+<script type="application/javascript;version=1.8">
 (function(){
 function genFunc() {
   var a = 5;