Bug 1613314 - Lazily create the UrlbarProviderInterventions QueryScorer. r=harry

Differential Revision: https://phabricator.services.mozilla.com/D61751

--HG--
extra : moz-landing-system : lando

browser/components/urlbar/UrlbarProviderInterventions.jsm

@@ -434,22 +434,23 @@ class ProviderInterventions extends UrlbarProvider {
     // The tip we should currently show.
     this.currentTip = TIPS.NONE;
 
-    // Object used to match the user's queries to tips.
-    this.queryScorer = new QueryScorer({
-      variations: new Map([
-        // Recognize "fire fox", "fox fire", and "foxfire" as "firefox".
-        ["firefox", ["fire fox", "fox fire", "foxfire"]],
-        // Recognize "mozila" as "mozilla".  This will catch common mispellings
-        // "mozila", "mozzila", and "mozzilla" (among others) due to the edit
-        // distance threshold of 1.
-        ["mozilla", ["mozila"]],
-      ]),
+    // This object is used to match the user's queries to tips.
+    XPCOMUtils.defineLazyGetter(this, "queryScorer", () => {
+      let queryScorer = new QueryScorer({
+        variations: new Map([
+          // Recognize "fire fox", "fox fire", and "foxfire" as "firefox".
+          ["firefox", ["fire fox", "fox fire", "foxfire"]],
+          // Recognize "mozila" as "mozilla".  This will catch common mispellings
+          // "mozila", "mozzila", and "mozzilla" (among others) due to the edit
+          // distance threshold of 1.
+          ["mozilla", ["mozila"]],
+        ]),
+      });
+      for (let [id, phrases] of Object.entries(DOCUMENTS)) {
+        queryScorer.addDocument({ id, phrases });
+      }
+      return queryScorer;
     });
-
-    // Initialize the query scorer.
-    for (let [id, phrases] of Object.entries(DOCUMENTS)) {
-      this.queryScorer.addDocument({ id, phrases });
-    }
   }
 
   /**