some fixes.

browser/components/bookmarks/content/bookmarksManager.xul

@@ -42,7 +42,6 @@
 <window id="bookmark-window" windowtype="bookmarks:manager"
         title="&bookmarksWindowTitle.label;" 
         xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
-        xmlns:web="http://home.netscape.com/WEB-rdf#"
         xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
         width="630" height="400" screenX="20" screenY="20"
         persist="width height screenX screenY sizemode"

browser/components/bookmarks/content/bookmarksTree.xml

@@ -758,8 +758,8 @@ dump("ONSELECTION CHANGED\n")
                     <treecell label="rdf:http://home.netscape.com/NC-rdf#ShortcutURL" />
                     <treecell label="rdf:http://home.netscape.com/NC-rdf#Description" />
                     <treecell label="rdf:http://home.netscape.com/NC-rdf#BookmarkAddDate" />
+                    <treecell label="rdf:http://home.netscape.com/WEB-rdf#LastModifiedDate" />
                     <treecell label="rdf:http://home.netscape.com/WEB-rdf#LastVisitDate"/>
-                    <treecell label="rdf:http://home.netscape.com/NC-rdf#LastModifiedDate" />
                   </treerow>
                 </treeitem>
               </treechildren>
@@ -774,8 +774,8 @@ dump("ONSELECTION CHANGED\n")
                     <treecell label="rdf:http://home.netscape.com/NC-rdf#ShortcutURL" />
                     <treecell label="rdf:http://home.netscape.com/NC-rdf#Description" />
                     <treecell label="rdf:http://home.netscape.com/NC-rdf#BookmarkAddDate" />
+                    <treecell label="rdf:http://home.netscape.com/WEB-rdf#LastModifiedDate" />
                     <treecell label="rdf:http://home.netscape.com/WEB-rdf#LastVisitDate"/>
-                    <treecell label="rdf:http://home.netscape.com/NC-rdf#LastModifiedDate" />
                   </treerow>
                 </treeitem>
               </treechildren>
@@ -810,12 +810,12 @@ dump("ONSELECTION CHANGED\n")
             <splitter class="tree-splitter" />
             <treecol id="LastModDate" label="&treecol.lastmod.label;" 
                          hidden="true" flex="1" class="sortDirectionIndicator" 
-                         sort="rdf:http://home.netscape.com/NC-rdf#LastModifiedDate" 
+                         sort="rdf:http://home.netscape.com/WEB-rdf#LastModifiedDate" 
                          persist="width hidden ordinal" />
             <splitter class="tree-splitter" />
             <treecol id="LastVisitDate" label="&treecol.lastvisit.label;" 
                          hidden="true" flex="1" class="sortDirectionIndicator" 
-                         sort="rdf:http://home.netscape.com/NC-rdf#LastVisitDate" 
+                         sort="rdf:http://home.netscape.com/WEB-rdf#LastVisitDate" 
                          persist="width hidden ordinal" />
           </treecols>
         </tree>