diff --git a/dom/tests/mochitest/whatwg/browserFu.js b/dom/tests/mochitest/whatwg/browserFu.js
deleted file mode 100644
index 3fb5bdf956..0000000000
--- a/dom/tests/mochitest/whatwg/browserFu.js
+++ /dev/null
@@ -1,6 +0,0 @@
-/**
- * File which includes stuff for Mozilla-specific checks which shouldn't happen
- * in other browsers but which we wish to test.
- */
-
-var isMozilla = navigator.product === "Gecko" && "buildID" in navigator;
diff --git a/dom/tests/mochitest/whatwg/mochitest.ini b/dom/tests/mochitest/whatwg/mochitest.ini
index ab853b86cf..685d4d32bb 100644
--- a/dom/tests/mochitest/whatwg/mochitest.ini
+++ b/dom/tests/mochitest/whatwg/mochitest.ini
@@ -1,6 +1,5 @@
[DEFAULT]
support-files =
- browserFu.js
postMessage_chrome_helper.html
postMessage_closed_helper.html
postMessage_hash.html
diff --git a/dom/tests/mochitest/whatwg/postMessage_helper.html b/dom/tests/mochitest/whatwg/postMessage_helper.html
index 86e34e9d4a..345616d089 100644
--- a/dom/tests/mochitest/whatwg/postMessage_helper.html
+++ b/dom/tests/mochitest/whatwg/postMessage_helper.html
@@ -2,7 +2,6 @@
postMessage message receiver
-
-
diff --git a/dom/tests/mochitest/whatwg/test_postMessage.html b/dom/tests/mochitest/whatwg/test_postMessage.html
index ca6389790f..83e8f4d962 100644
--- a/dom/tests/mochitest/whatwg/test_postMessage.html
+++ b/dom/tests/mochitest/whatwg/test_postMessage.html
@@ -6,7 +6,6 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=postMessage
Basic postMessage tests
-
@@ -52,10 +51,7 @@ function messageReceiver(evt)
"postMessage creates events with empty lastEventId");
is(evt.type, "message", "expected events of type 'message'");
- if (isMozilla)
- {
- ok(evt.isTrusted === false, "shouldn't have been a trusted event");
- }
+ ok(evt.isTrusted === true, "should have been a trusted event");
var data = evt.data;
diff --git a/dom/tests/mochitest/whatwg/test_postMessage_basehref.html b/dom/tests/mochitest/whatwg/test_postMessage_basehref.html
index f2d40e8436..5c23dca768 100644
--- a/dom/tests/mochitest/whatwg/test_postMessage_basehref.html
+++ b/dom/tests/mochitest/whatwg/test_postMessage_basehref.html
@@ -6,7 +6,6 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=414815
postMessage's interaction with a <base> tag
-
diff --git a/dom/tests/mochitest/whatwg/test_postMessage_closed.html b/dom/tests/mochitest/whatwg/test_postMessage_closed.html
index 5a6f3f9286..8b3737d436 100644
--- a/dom/tests/mochitest/whatwg/test_postMessage_closed.html
+++ b/dom/tests/mochitest/whatwg/test_postMessage_closed.html
@@ -3,7 +3,6 @@
postMessage's interaction with closed windows
-
diff --git a/dom/tests/mochitest/whatwg/test_postMessage_hash.html b/dom/tests/mochitest/whatwg/test_postMessage_hash.html
index 30996ef497..1523136f34 100644
--- a/dom/tests/mochitest/whatwg/test_postMessage_hash.html
+++ b/dom/tests/mochitest/whatwg/test_postMessage_hash.html
@@ -3,7 +3,6 @@
postMessage's interaction with hash URIs
-
diff --git a/dom/tests/mochitest/whatwg/test_postMessage_idn.xhtml b/dom/tests/mochitest/whatwg/test_postMessage_idn.xhtml
index 7c1178f26e..7c84bea37c 100644
--- a/dom/tests/mochitest/whatwg/test_postMessage_idn.xhtml
+++ b/dom/tests/mochitest/whatwg/test_postMessage_idn.xhtml
@@ -7,7 +7,6 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=postMessage
postMessage uri/domain values and IDN encoding
-
@@ -31,10 +30,7 @@ function receiveMessage(evt)
ok(evt instanceof MessageEvent, "umm, how did we get this?");
is(evt.type, "message", "expected events of type 'message'");
- if (isMozilla)
- {
- ok(evt.isTrusted === false, "shouldn't have been a trusted event");
- }
+ ok(evt.isTrusted === true, "should have been a trusted event");
is(evt.origin, "http://sub1.ält.example.org:8000",
"wrong origin -- IDN issue, perhaps?");
diff --git a/dom/tests/mochitest/whatwg/test_postMessage_jar.html b/dom/tests/mochitest/whatwg/test_postMessage_jar.html
index 3bc453921b..96ba9f3418 100644
--- a/dom/tests/mochitest/whatwg/test_postMessage_jar.html
+++ b/dom/tests/mochitest/whatwg/test_postMessage_jar.html
@@ -6,7 +6,6 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=430251
postMessage's interaction with pages at jar: URIs
-
diff --git a/dom/tests/mochitest/whatwg/test_postMessage_joined.html b/dom/tests/mochitest/whatwg/test_postMessage_joined.html
index 034151a12e..54226683c4 100644
--- a/dom/tests/mochitest/whatwg/test_postMessage_joined.html
+++ b/dom/tests/mochitest/whatwg/test_postMessage_joined.html
@@ -6,7 +6,6 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=postMessage
postMessage with document.domain setting to join origins
-
@@ -29,10 +28,7 @@ function receiveTestResult(evt)
ok(evt instanceof MessageEvent, "umm, how did we get this?");
is(evt.type, "message", "expected events of type 'message'");
- if (isMozilla)
- {
- ok(evt.isTrusted === false, "shouldn't have been a trusted event");
- }
+ ok(evt.isTrusted === true, "should have been a trusted event");
is(evt.lastEventId, "", "postMessage creates events with empty lastEventId");
diff --git a/dom/tests/mochitest/whatwg/test_postMessage_origin.xhtml b/dom/tests/mochitest/whatwg/test_postMessage_origin.xhtml
index e48bee136d..7449dba623 100644
--- a/dom/tests/mochitest/whatwg/test_postMessage_origin.xhtml
+++ b/dom/tests/mochitest/whatwg/test_postMessage_origin.xhtml
@@ -6,7 +6,6 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=417075
postMessage from about:blank, data URLs
-
diff --git a/dom/tests/mochitest/whatwg/test_postMessage_special.xhtml b/dom/tests/mochitest/whatwg/test_postMessage_special.xhtml
index bf443af99b..36cd894345 100644
--- a/dom/tests/mochitest/whatwg/test_postMessage_special.xhtml
+++ b/dom/tests/mochitest/whatwg/test_postMessage_special.xhtml
@@ -6,7 +6,6 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=postMessage
postMessage from about:blank, data URLs
-
@@ -109,10 +108,7 @@ function messageReceiver(evt)
ok(evt instanceof MessageEvent, "umm, how did we get this?");
is(evt.type, "message", "expected events of type 'message'");
- if (isMozilla)
- {
- ok(evt.isTrusted === false, "shouldn't have been a trusted event");
- }
+ ok(evt.isTrusted === true, "should have been a trusted event");
if (evt.data === "about:blank-response")
{
diff --git a/dom/tests/mochitest/whatwg/test_postMessage_transfer.html b/dom/tests/mochitest/whatwg/test_postMessage_transfer.html
index 996a04f513..1b6492e182 100644
--- a/dom/tests/mochitest/whatwg/test_postMessage_transfer.html
+++ b/dom/tests/mochitest/whatwg/test_postMessage_transfer.html
@@ -6,7 +6,6 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=822094
postMessage transferable tests
-