import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

toolkit/themes/shared/reader/RM-Content-Width-Plus-44x16.svg

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+
+<!-- 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 version="1.1"
+     xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     width="44"
+     height="16"
+     viewBox="0 0 44 16"
+     fill="#808080">
+
+  <path d="M14.5,7 L8.75,1.25 L10,-1.91791433e-15 L18,8 L17.375,8.625 L10,16 L8.75,14.75 L14.5,9 L1.13686838e-13,9 L1.13686838e-13,7 L14.5,7 Z" transform="translate(9.000000, 8.000000) scale(-1, 1) translate(-9.000000, -8.000000)"/>
+  <path d="M40.5,7 L34.75,1.25 L36,-5.17110888e-16 L44,8 L43.375,8.625 L36,16 L34.75,14.75 L40.5,9 L26,9 L26,7 L40.5,7 Z"/>
+
+</svg>