Bug 1874186 - Remove remains of extension ID facility from OpenSearch engines. r=search-reviewers,daleharvey

Differential Revision: https://phabricator.services.mozilla.com/D198284

toolkit/components/search/OpenSearchEngine.sys.mjs

@@ -236,9 +236,6 @@ export class OpenSearchEngine extends SearchEngine {
         lazy.SearchUtils.sanitizeName(this.name),
         this._uri
       );
-      if (this._extensionID) {
-        this._loadPath += ":" + this._extensionID;
-      }
       this.setAttr(
         "loadPathHash",
         lazy.SearchUtils.getVerificationHash(this._loadPath)
@@ -417,9 +414,6 @@ export class OpenSearchEngine extends SearchEngine {
         case "IconUpdateUrl":
           this._iconUpdateURL = child.textContent;
           break;
-        case "ExtensionID":
-          this._extensionID = child.textContent;
-          break;
       }
     }
     if (!this.name || !this._urls.length) {