diff --git a/browser/base/skin/browser.css b/browser/base/skin/browser.css
index dfa240f5c1d7..596c7e1a95b8 100644
--- a/browser/base/skin/browser.css
+++ b/browser/base/skin/browser.css
@@ -556,7 +556,7 @@ statusbarpanel#statusbar-display {
 
 /* ::::: autocomplete ::::: */
 
-.autocomplete-treebody:-moz-tree-cell-text(treecolAutoCompleteComment) {
+.autocomplete-treebody::-moz-tree-cell-text(treecolAutoCompleteComment) {
   color: #555566;
 }
 
diff --git a/browser/components/bookmarks/content/bookmarks.css b/browser/components/bookmarks/content/bookmarks.css
index ae3603f4be65..ff7cf63c43b2 100644
--- a/browser/components/bookmarks/content/bookmarks.css
+++ b/browser/components/bookmarks/content/bookmarks.css
@@ -10,7 +10,7 @@ bookmarks-tree[type="folders"] {
   -moz-binding: url("chrome://browser/content/bookmarks/bookmarksTree.xml#bookmarks-tree-folders");
 }
 
-treechildren:-moz-tree-image(Name) {
+treechildren::-moz-tree-image(Name) {
   width:16px;
   height:16px;
 }
diff --git a/browser/components/downloads/skin/downloadmanager.css b/browser/components/downloads/skin/downloadmanager.css
index 485aede1084e..be047d01a586 100644
--- a/browser/components/downloads/skin/downloadmanager.css
+++ b/browser/components/downloads/skin/downloadmanager.css
@@ -12,7 +12,7 @@ download {
   min-height: 25px;
 }
 
-#downloadHistoryView > treechildren:-moz-tree-image(Name) {
+#downloadHistoryView > treechildren::-moz-tree-image(Name) {
   margin-right: 2px;
 }