diff --git a/toolkit/components/resistfingerprinting/content/usercharacteristics.css b/toolkit/components/resistfingerprinting/content/usercharacteristics.css
new file mode 100644
index 000000000000..2294c5ade3d7
--- /dev/null
+++ b/toolkit/components/resistfingerprinting/content/usercharacteristics.css
@@ -0,0 +1,7 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+.testcanvas {
+ border: 1px solid #2600ff;
+}
diff --git a/toolkit/components/resistfingerprinting/content/usercharacteristics.html b/toolkit/components/resistfingerprinting/content/usercharacteristics.html
index 50071bb21e4c..eb85f07dc017 100644
--- a/toolkit/components/resistfingerprinting/content/usercharacteristics.html
+++ b/toolkit/components/resistfingerprinting/content/usercharacteristics.html
@@ -8,11 +8,195 @@