fixed styling in firefox

lib/ace/ext/static.css

@@ -4,13 +4,16 @@
 }
 
 .ace_editor .ace_gutter { 
-    width: 20px; 
-    display: inline-block; 
+    width: 25px !important;
+    display: block;
+    float: left;
     text-align: right; 
     padding: 0 3px 0 0; 
     margin-right: 3px;
 }
 
+.ace-row { clear: both; }
+
 *.ace_gutter-cell {
   -moz-user-select: -moz-none;
   -khtml-user-select: none;

lib/ace/ext/static_highlight.js

@@ -71,9 +71,10 @@ exports.render = function(input, mode, theme) {
     
     for(var ix = 0; ix < length; ix++) {
         var lineTokens = tokens[ix].tokens;
+        stringBuilder.push("<div class='ace-row'>");
         stringBuilder.push("<span class='ace_gutter ace_gutter-cell' unselectable='on'>" + (ix+1) + "</span>");
         textLayer.$renderLine(stringBuilder, 0, lineTokens, true);
-        stringBuilder.push("<br>");
+        stringBuilder.push("</div>");
     }
     
     // let's prepare the whole html