diff --git a/phpBB/styles/prosilver/theme/base.css b/phpBB/styles/prosilver/theme/base.css
index 8c03e4891d..88f591492a 100644
--- a/phpBB/styles/prosilver/theme/base.css
+++ b/phpBB/styles/prosilver/theme/base.css
@@ -105,3 +105,11 @@ ul {
  * might still respond to pointer events.
  */
 [tabindex="-1"]:focus { outline: none !important }
+
+/**
+ * Remove double underline from recent version of firefox
+ */
+abbr[title] {
+    text-decoration: none;
+}
+
diff --git a/phpBB/styles/prosilver/theme/normalize.css b/phpBB/styles/prosilver/theme/normalize.css
index 80194760ff..a7ebfad424 100644
--- a/phpBB/styles/prosilver/theme/normalize.css
+++ b/phpBB/styles/prosilver/theme/normalize.css
@@ -1,28 +1,35 @@
-/*! normalize.css v3.0.1 | MIT License | git.io/normalize */
+/*! normalize.css v3.0.3 | MIT License | github.com/necolas/normalize.css */
 
 /**
  * 1. Set default font family to sans-serif.
- * 2. Prevent iOS text size adjust after orientation change, without disabling
- *    user zoom.
+ * 2. Prevent iOS and IE text size adjust after device orientation change,
+ *    without disabling user zoom.
  */
+
 html {
-    font-family: sans-serif; /* 1 */
-    -ms-text-size-adjust: 100%; /* 2 */
-    -webkit-text-size-adjust: 100%; /* 2 */
+	font-family: sans-serif; /* 1 */
+	-ms-text-size-adjust: 100%; /* 2 */
+	-webkit-text-size-adjust: 100%; /* 2 */
 }
 
 /**
  * Remove default margin.
  */
-body { margin: 0 }
+
+body {
+	margin: 0;
+}
 
 /* HTML5 display definitions
-   ========================================================================== */
+	 ========================================================================== */
+
 /**
  * Correct `block` display not defined for any HTML5 element in IE 8/9.
- * Correct `block` display not defined for `details` or `summary` in IE 10/11 and Firefox.
+ * Correct `block` display not defined for `details` or `summary` in IE 10/11
+ * and Firefox.
  * Correct `block` display not defined for `main` in IE 11.
  */
+
 article,
 aside,
 details,
@@ -32,175 +39,233 @@ footer,
 header,
 hgroup,
 main,
+menu,
 nav,
 section,
-summary { display: block }
+summary {
+	display: block;
+}
 
 /**
  * 1. Correct `inline-block` display not defined in IE 8/9.
  * 2. Normalize vertical alignment of `progress` in Chrome, Firefox, and Opera.
  */
+
 audio,
 canvas,
 progress,
 video {
-    display: inline-block; /* 1 */
-    vertical-align: baseline; /* 2 */
+	display: inline-block; /* 1 */
+	vertical-align: baseline; /* 2 */
 }
 
 /**
  * Prevent modern browsers from displaying `audio` without controls.
  * Remove excess height in iOS 5 devices.
  */
+
 audio:not([controls]) {
-    display: none;
-    height: 0;
+	display: none;
+	height: 0;
 }
 
 /**
  * Address `[hidden]` styling not present in IE 8/9/10.
- * Hide the `template` element in IE 8/9/11, Safari, and Firefox < 22.
+ * Hide the `template` element in IE 8/9/10/11, Safari, and Firefox < 22.
  */
+
 [hidden],
-template { display: none }
+template {
+	display: none;
+}
 
 /* Links
-   ========================================================================== */
+	 ========================================================================== */
+
 /**
  * Remove the gray background color from active links in IE 10.
  */
-a { background: transparent }
+
+a {
+	background-color: transparent;
+}
 
 /**
- * Improve readability when focused and also mouse hovered in all browsers.
+ * Improve readability of focused elements when they are also in an
+ * active/hover state.
  */
+
 a:active,
-a:hover { outline: 0 }
+a:hover {
+	outline: 0;
+}
 
 /* Text-level semantics
-   ========================================================================== */
+	 ========================================================================== */
+
 /**
  * Address styling not present in IE 8/9/10/11, Safari, and Chrome.
  */
-abbr[title] { border-bottom: 1px dotted }
+
+abbr[title] {
+	border-bottom: 1px dotted;
+}
 
 /**
  * Address style set to `bolder` in Firefox 4+, Safari, and Chrome.
  */
+
 b,
-strong { font-weight: bold }
+strong {
+	font-weight: bold;
+}
 
 /**
  * Address styling not present in Safari and Chrome.
  */
-dfn { font-style: italic }
+
+dfn {
+	font-style: italic;
+}
 
 /**
  * Address variable `h1` font-size and margin within `section` and `article`
  * contexts in Firefox 4+, Safari, and Chrome.
  */
+
 h1 {
-    font-size: 2em;
-    margin: 0.67em 0;
+	font-size: 2em;
+	margin: 0.67em 0;
 }
 
 /**
  * Address styling not present in IE 8/9.
  */
+
 mark {
-    background: #ff0;
-    color: #000;
+	background: #ff0;
+	color: #000;
 }
 
 /**
  * Address inconsistent and variable font size in all browsers.
  */
-small { font-size: 80% }
+
+small {
+	font-size: 80%;
+}
 
 /**
  * Prevent `sub` and `sup` affecting `line-height` in all browsers.
  */
+
 sub,
 sup {
-    font-size: 75%;
-    line-height: 0;
-    position: relative;
-    vertical-align: baseline;
+	font-size: 75%;
+	line-height: 0;
+	position: relative;
+	vertical-align: baseline;
 }
 
-sup { top: -0.5em }
-sub { bottom: -0.25em }
+sup {
+	top: -0.5em;
+}
+
+sub {
+	bottom: -0.25em;
+}
 
 /* Embedded content
-   ========================================================================== */
+	 ========================================================================== */
+
 /**
  * Remove border when inside `a` element in IE 8/9/10.
  */
-img { border: 0 }
+
+img {
+	border: 0;
+}
 
 /**
  * Correct overflow not hidden in IE 9/10/11.
  */
-svg:not(:root) { overflow: hidden }
+
+svg:not(:root) {
+	overflow: hidden;
+}
 
 /* Grouping content
-   ========================================================================== */
+	 ========================================================================== */
+
 /**
  * Address margin not present in IE 8/9 and Safari.
  */
-figure { margin: 1em 40px }
+
+figure {
+	margin: 1em 40px;
+}
 
 /**
  * Address differences between Firefox and other browsers.
  */
+
 hr {
-    -moz-box-sizing: content-box;
-    box-sizing: content-box;
-    height: 0;
+	box-sizing: content-box;
+	height: 0;
 }
 
 /**
  * Contain overflow in all browsers.
  */
-pre { overflow: auto }
+
+pre {
+	overflow: auto;
+}
 
 /**
  * Address odd `em`-unit font size rendering in all browsers.
  */
+
 code,
 kbd,
 pre,
 samp {
-    font-family: monospace, monospace;
-    font-size: 1em;
+	font-family: monospace, monospace;
+	font-size: 1em;
 }
 
 /* Forms
-   ========================================================================== */
+	 ========================================================================== */
+
 /**
  * Known limitation: by default, Chrome and Safari on OS X allow very limited
  * styling of `select`, unless a `border` property is set.
  */
+
 /**
  * 1. Correct color not being inherited.
  *    Known issue: affects color of disabled elements.
  * 2. Correct font properties not being inherited.
  * 3. Address margins set differently in Firefox 4+, Safari, and Chrome.
  */
+
 button,
 input,
 optgroup,
 select,
 textarea {
-    color: inherit; /* 1 */
-    font: inherit; /* 2 */
-    margin: 0; /* 3 */
+	color: inherit; /* 1 */
+	font: inherit; /* 2 */
+	margin: 0; /* 3 */
 }
 
 /**
  * Address `overflow` set to `hidden` in IE 8/9/10/11.
  */
-button { overflow: visible }
+
+button {
+	overflow: visible;
+}
 
 /**
  * Address inconsistent `text-transform` inheritance for `button` and `select`.
@@ -208,8 +273,11 @@ button { overflow: visible }
  * Correct `button` style inheritance in Firefox, IE 8/9/10/11, and Opera.
  * Correct `select` style inheritance in Firefox.
  */
+
 button,
-select { text-transform: none }
+select {
+	text-transform: none;
+}
 
 /**
  * 1. Avoid the WebKit bug in Android 4.0.* where (2) destroys native `audio`
@@ -218,34 +286,42 @@ select { text-transform: none }
  * 3. Improve usability and consistency of cursor style between image-type
  *    `input` and others.
  */
+
 button,
 html input[type="button"], /* 1 */
 input[type="reset"],
 input[type="submit"] {
-    -webkit-appearance: button; /* 2 */
-    cursor: pointer; /* 3 */
+	-webkit-appearance: button; /* 2 */
+	cursor: pointer; /* 3 */
 }
 
 /**
  * Re-set default cursor for disabled elements.
  */
+
 button[disabled],
-html input[disabled] { cursor: default }
+html input[disabled] {
+	cursor: default;
+}
 
 /**
  * Remove inner padding and border in Firefox 4+.
  */
+
 button::-moz-focus-inner,
 input::-moz-focus-inner {
-    border: 0;
-    padding: 0;
+	border: 0;
+	padding: 0;
 }
 
 /**
  * Address Firefox 4+ setting `line-height` on `input` using `!important` in
  * the UA stylesheet.
  */
-input { line-height: normal }
+
+input {
+	line-height: normal;
+}
 
 /**
  * It's recommended that you don't attempt to style these elements.
@@ -254,10 +330,11 @@ input { line-height: normal }
  * 1. Address box sizing set to `content-box` in IE 8/9/10.
  * 2. Remove excess padding in IE 8/9/10.
  */
+
 input[type="checkbox"],
 input[type="radio"] {
-    box-sizing: border-box; /* 1 */
-    padding: 0; /* 2 */
+	box-sizing: border-box; /* 1 */
+	padding: 0; /* 2 */
 }
 
 /**
@@ -265,19 +342,20 @@ input[type="radio"] {
  * `font-size` values of the `input`, it causes the cursor style of the
  * decrement button to change from `default` to `text`.
  */
+
 input[type="number"]::-webkit-inner-spin-button,
-input[type="number"]::-webkit-outer-spin-button { height: auto }
+input[type="number"]::-webkit-outer-spin-button {
+	height: auto;
+}
 
 /**
  * 1. Address `appearance` set to `searchfield` in Safari and Chrome.
- * 2. Address `box-sizing` set to `border-box` in Safari and Chrome
- *    (include `-moz` to future-proof).
+ * 2. Address `box-sizing` set to `border-box` in Safari and Chrome.
  */
+
 input[type="search"] {
-    -webkit-appearance: textfield; /* 1 */
-    -moz-box-sizing: content-box;
-    -webkit-box-sizing: content-box; /* 2 */
-    box-sizing: content-box;
+	-webkit-appearance: textfield; /* 1 */
+	box-sizing: content-box; /* 2 */
 }
 
 /**
@@ -285,47 +363,62 @@ input[type="search"] {
  * Safari (but not Chrome) clips the cancel button when the search input has
  * padding (and `textfield` appearance).
  */
+
 input[type="search"]::-webkit-search-cancel-button,
-input[type="search"]::-webkit-search-decoration { -webkit-appearance: none }
+input[type="search"]::-webkit-search-decoration {
+	-webkit-appearance: none;
+}
 
 /**
  * Define consistent border, margin, and padding.
  */
+
 fieldset {
-    border: 1px solid #c0c0c0;
-    margin: 0 2px;
-    padding: 0.35em 0.625em 0.75em;
+	border: 1px solid #c0c0c0;
+	margin: 0 2px;
+	padding: 0.35em 0.625em 0.75em;
 }
 
 /**
  * 1. Correct `color` not being inherited in IE 8/9/10/11.
  * 2. Remove padding so people aren't caught out if they zero out fieldsets.
  */
+
 legend {
-    border: 0; /* 1 */
-    padding: 0; /* 2 */
+	border: 0; /* 1 */
+	padding: 0; /* 2 */
 }
 
 /**
  * Remove default vertical scrollbar in IE 8/9/10/11.
  */
-textarea { overflow: auto }
+
+textarea {
+	overflow: auto;
+}
 
 /**
  * Don't inherit the `font-weight` (applied by a rule above).
  * NOTE: the default cannot safely be changed in Chrome and Safari on OS X.
  */
-optgroup { font-weight: bold }
+
+optgroup {
+	font-weight: bold;
+}
 
 /* Tables
-   ========================================================================== */
+	 ========================================================================== */
+
 /**
  * Remove most spacing between table cells.
  */
+
 table {
-    border-collapse: collapse;
-    border-spacing: 0;
+	border-collapse: collapse;
+	border-spacing: 0;
 }
 
 td,
-th { padding: 0 }
+th {
+	padding: 0;
+}
\ No newline at end of file