Bug 1642597 - Don't override the amazon search top site if it was re-added manually. r=mikedeboer

Differential Revision: https://phabricator.services.mozilla.com/D78256

browser/components/newtab/lib/TopSitesFeed.jsm

@@ -430,7 +430,12 @@ this.TopSitesFeed = class TopSitesFeed {
         link.typedBonus = true;
 
         if (amazonSearchTileOverrideURL) {
-          if (link.searchTopSite && link.label === "@amazon") {
+          // The `searchVendor` property is set if the engine was re-added manually.
+          if (
+            link.searchTopSite &&
+            !link.searchVendor &&
+            link.label === "@amazon"
+          ) {
             delete link.searchTopSite;
             delete link.label;
             link.url = amazonSearchTileOverrideURL;