Bug 1664814: Limit the number of tokens to reduce calculate time. r=adw

Differential Revision: https://phabricator.services.mozilla.com/D123043

browser/components/urlbar/UrlbarUtils.jsm

@@ -400,7 +400,9 @@ var UrlbarUtils = {
       highlightType == this.HIGHLIGHT.SUGGESTED ? 1 : 0
     );
     let compareIgnoringDiacritics;
-    for (let { lowerCaseValue: needle } of tokens) {
+    for (let i = 0, totalTokensLength = 0; i < tokens.length; i++) {
+      const { lowerCaseValue: needle } = tokens[i];
+
       // Ideally we should never hit the empty token case, but just in case
       // the `needle` check protects us from an infinite loop.
       if (!needle) {
@@ -473,6 +475,12 @@ var UrlbarUtils = {
           }
         }
       }
+
+      totalTokensLength += needle.length;
+      if (totalTokensLength > UrlbarUtils.MAX_TEXT_LENGTH) {
+        // Limit the number of tokens to reduce calculate time.
+        break;
+      }
     }
     // Starting from the collision array, generate [start, len] tuples
     // representing the ranges to be highlighted.