Handle multiple bridge instances within navigator interface (#1848)

* Handle multiple bridge instances within navigator interface

* Remove unnecessary if statement

Author: brianhall

injected/src/features/navigator-interface.js

@@ -2,6 +2,8 @@ import { DDGPromise } from '../utils';
 import ContentFeature from '../content-feature';
 import { createPageWorldBridge } from './message-bridge/create-page-world-bridge.js';
 
+const store = {};
+
 export default class NavigatorInterface extends ContentFeature {
     load(args) {
         if (this.matchConditionalFeatureSetting('privilegedDomains').length) {
@@ -35,7 +37,13 @@ export default class NavigatorInterface extends ContentFeature {
                      * @throws {Error}
                      */
                     createMessageBridge(featureName) {
-                        return createPageWorldBridge(featureName, args.messageSecret);
+                        const existingBridge = store[featureName];
+                        if (existingBridge) return existingBridge;
+
+                        const bridge = createPageWorldBridge(featureName, args.messageSecret);
+
+                        store[featureName] = bridge;
+                        return bridge;
                     },
                 },
                 enumerable: true,