Replace application/basilisk with browser/

browser/themes/windows/customizableui/menu-arrow.svg

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- 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 http://mozilla.org/MPL/2.0/. -->
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" height="16" width="16" viewBox="0 0 16 16">
+  <style>
+    use:not(:target) {
+      display: none;
+    }
+    use {
+      fill: MenuText;
+    }
+    use[id$="-disabled"] {
+      fill: GrayText;
+    }
+    use[id$="-hover"] {
+      fill: HighlightText;
+    }
+  </style>
+  <defs>
+    <path id="arrow-shape" d="m 6,4 0,8 5,-4 z"/>
+  </defs>
+  <use id="arrow" xlink:href="#arrow-shape"/>
+  <use id="arrow-disabled" xlink:href="#arrow-shape"/>
+  <use id="arrow-hover" xlink:href="#arrow-shape"/>
+</svg>