diff --git a/devtools/client/inspector/markup/test/browser.ini b/devtools/client/inspector/markup/test/browser.ini
index 3116e4beb1..9ff73a6c69 100644
--- a/devtools/client/inspector/markup/test/browser.ini
+++ b/devtools/client/inspector/markup/test/browser.ini
@@ -32,6 +32,8 @@ support-files =
doc_markup_void_elements.xhtml
doc_markup_whitespace.html
doc_markup_xul.xul
+ doc_markup_update-on-navigtion_1.html
+ doc_markup_update-on-navigtion_2.html
head.js
helper_attributes_test_runner.js
helper_events_test_runner.js
diff --git a/devtools/client/inspector/markup/test/browser_markup_update-on-navigtion.js b/devtools/client/inspector/markup/test/browser_markup_update-on-navigtion.js
index 241cea6723..c298878c32 100644
--- a/devtools/client/inspector/markup/test/browser_markup_update-on-navigtion.js
+++ b/devtools/client/inspector/markup/test/browser_markup_update-on-navigtion.js
@@ -5,9 +5,8 @@
// Test that markup view handles page navigation correctly.
-const SCHEMA = "data:text/html;charset=UTF-8,";
-const URL_1 = SCHEMA + "
ONE
";
-const URL_2 = SCHEMA + "TWO
";
+const URL_1 = URL_ROOT + "doc_markup_update-on-navigtion_1.html";
+const URL_2 = URL_ROOT + "doc_markup_update-on-navigtion_2.html";
add_task(function* () {
let {inspector, testActor} = yield openInspectorForURL(URL_1);
diff --git a/devtools/client/inspector/markup/test/doc_markup_update-on-navigtion_1.html b/devtools/client/inspector/markup/test/doc_markup_update-on-navigtion_1.html
new file mode 100644
index 0000000000..d2fdb16294
--- /dev/null
+++ b/devtools/client/inspector/markup/test/doc_markup_update-on-navigtion_1.html
@@ -0,0 +1 @@
+ONE
diff --git a/devtools/client/inspector/markup/test/doc_markup_update-on-navigtion_2.html b/devtools/client/inspector/markup/test/doc_markup_update-on-navigtion_2.html
new file mode 100644
index 0000000000..93d84a0885
--- /dev/null
+++ b/devtools/client/inspector/markup/test/doc_markup_update-on-navigtion_2.html
@@ -0,0 +1 @@
+TWO
diff --git a/docshell/base/crashtests/914521.html b/docshell/base/crashtests/914521.html
index 9ae18b8606..eb0a437491 100644
--- a/docshell/base/crashtests/914521.html
+++ b/docshell/base/crashtests/914521.html
@@ -20,6 +20,14 @@ function f()
finish();
}
+function init()
+{
+ SpecialPowers.pushPrefEnv({"set": [
+ ["security.data_uri.block_toplevel_data_uri_navigations", false],
+ ]}, start);
+
+}
+
function start()
{
var html = "
-
+