Bug 685059 - Remove empty placeholder icon in tabs when a page has no favicon. r=dao,ui-r=shorlander.

browser/base/content/tabbrowser.css

@@ -41,6 +41,7 @@ tabpanels {
   z-index: 2;
 }
 
+.tab-icon-image:not([src]):not([pinned]),
 .tab-throbber:not([busy]),
 .tab-throbber[busy] + .tab-icon-image {
   display: none;

browser/themes/linux/browser.css

@@ -1612,10 +1612,7 @@ toolbar[iconsize="small"] #bookmarks-menu-button[starred],
 
 .tab-throbber,
 .tab-icon-image {
-  width: 16px;
-  height: 16px;
   -moz-margin-end: 3px;
-  list-style-image: url("chrome://mozapps/skin/places/defaultFavicon.png");
 }
 
 .tab-throbber {

browser/themes/osx/browser.css

@@ -2181,11 +2181,13 @@ toolbarbutton.chevron > .toolbarbutton-menu-dropmarker {
 
 %include ../shared/tabs.inc.css
 
+.tab-label {
+  margin: 0;
+}
+
 .tab-throbber,
 .tab-icon-image {
-  width: 16px;
-  height: 16px;
-  list-style-image: url("chrome://mozapps/skin/places/defaultFavicon.png");
+  -moz-margin-end: 6px;
 }
 
 .tab-throbber {

browser/themes/shared/tabs.inc.css

@@ -210,3 +210,16 @@
   clip-path: url(chrome://browser/content/browser.xul#tab-clip-path-outer);
   width: 66px;
 }
+
+
+/* Tab icons */
+
+.tab-throbber,
+.tab-icon-image {
+  width: 16px;
+  height: 16px;
+}
+
+.tab-icon-image {
+  list-style-image: url("chrome://mozapps/skin/places/defaultFavicon.png");
+}

browser/themes/windows/browser.css

@@ -1987,13 +1987,6 @@ richlistitem[type~="action"][actiontype="switchtab"] > .ac-url-box > .ac-action-
   text-shadow: 0 -0.5px 1.5px white;
 }
 
-.tab-throbber,
-.tab-icon-image {
-  width: 16px;
-  height: 16px;
-  list-style-image: url("chrome://mozapps/skin/places/defaultFavicon.png");
-}
-
 .tab-throbber {
   list-style-image: url("chrome://browser/skin/tabbrowser/connecting.png");
 }