diff --git a/apps/browser/src/background/main.background.ts b/apps/browser/src/background/main.background.ts
index 00c2ba7a7fb..d6a3ddacc48 100644
--- a/apps/browser/src/background/main.background.ts
+++ b/apps/browser/src/background/main.background.ts
@@ -66,7 +66,6 @@ import { PolicyApiService } from "@bitwarden/common/services/policy/policy-api.s
 import { ProviderService } from "@bitwarden/common/services/provider.service";
 import { SearchService } from "@bitwarden/common/services/search.service";
 import { SendService } from "@bitwarden/common/services/send.service";
-import { SettingsService } from "@bitwarden/common/services/settings.service";
 import { StateMigrationService } from "@bitwarden/common/services/stateMigration.service";
 import { SyncService } from "@bitwarden/common/services/sync/sync.service";
 import { SyncNotifierService } from "@bitwarden/common/services/sync/syncNotifier.service";
@@ -93,6 +92,7 @@ import { BrowserEnvironmentService } from "../services/browser-environment.servi
 import { BrowserFolderService } from "../services/browser-folder.service";
 import { BrowserOrganizationService } from "../services/browser-organization.service";
 import { BrowserPolicyService } from "../services/browser-policy.service";
+import { BrowserSettingsService } from "../services/browser-settings.service";
 import { BrowserStateService } from "../services/browser-state.service";
 import { BrowserCryptoService } from "../services/browserCrypto.service";
 import BrowserLocalStorageService from "../services/browserLocalStorage.service";
@@ -282,7 +282,7 @@ export default class MainBackground {
       this.appIdService,
       (expired: boolean) => this.logout(expired)
     );
-    this.settingsService = new SettingsService(this.stateService);
+    this.settingsService = new BrowserSettingsService(this.stateService);
     this.fileUploadService = new FileUploadService(this.logService, this.apiService);
     this.cipherService = new CipherService(
       this.cryptoService,
diff --git a/apps/browser/src/popup/services/services.module.ts b/apps/browser/src/popup/services/services.module.ts
index 41dabd9e166..ddfc8a675f1 100644
--- a/apps/browser/src/popup/services/services.module.ts
+++ b/apps/browser/src/popup/services/services.module.ts
@@ -67,6 +67,7 @@ import { BrowserStateService as StateServiceAbstraction } from "../../services/a
 import { BrowserEnvironmentService } from "../../services/browser-environment.service";
 import { BrowserOrganizationService } from "../../services/browser-organization.service";
 import { BrowserPolicyService } from "../../services/browser-policy.service";
+import { BrowserSettingsService } from "../../services/browser-settings.service";
 import { BrowserStateService } from "../../services/browser-state.service";
 import { BrowserFileDownloadService } from "../../services/browserFileDownloadService";
 import BrowserMessagingService from "../../services/browserMessaging.service";
@@ -228,8 +229,10 @@ function getBgService<T>(service: keyof MainBackground) {
     { provide: SyncService, useFactory: getBgService<SyncService>("syncService"), deps: [] },
     {
       provide: SettingsService,
-      useFactory: getBgService<SettingsService>("settingsService"),
-      deps: [],
+      useFactory: (stateService: StateService) => {
+        return new BrowserSettingsService(stateService);
+      },
+      deps: [StateService],
     },
     {
       provide: AbstractStorageService,
diff --git a/apps/browser/src/services/browser-settings.service.ts b/apps/browser/src/services/browser-settings.service.ts
new file mode 100644
index 00000000000..78b4f76ea6a
--- /dev/null
+++ b/apps/browser/src/services/browser-settings.service.ts
@@ -0,0 +1,11 @@
+import { BehaviorSubject } from "rxjs";
+
+import { AccountSettingsSettings } from "@bitwarden/common/models/domain/account";
+import { SettingsService } from "@bitwarden/common/services/settings.service";
+
+import { sessionSync } from "../decorators/session-sync-observable";
+
+export class BrowserSettingsService extends SettingsService {
+  @sessionSync({ initializer: (obj: string[][]) => obj })
+  protected _settings: BehaviorSubject<AccountSettingsSettings>;
+}
diff --git a/libs/common/src/models/domain/account.ts b/libs/common/src/models/domain/account.ts
index 9fe36001d03..0715b0c49b6 100644
--- a/libs/common/src/models/domain/account.ts
+++ b/libs/common/src/models/domain/account.ts
@@ -251,7 +251,7 @@ export class AccountSettings {
 }
 
 export type AccountSettingsSettings = {
-  equivalentDomains?: { [id: string]: any };
+  equivalentDomains?: string[][];
 };
 
 export class AccountTokens {
diff --git a/libs/common/src/services/cipher.service.ts b/libs/common/src/services/cipher.service.ts
index a7b54942e2c..b93c60d6228 100644
--- a/libs/common/src/services/cipher.service.ts
+++ b/libs/common/src/services/cipher.service.ts
@@ -412,7 +412,7 @@ export class CipherService implements CipherServiceAbstraction {
         : firstValueFrom(this.settingsService.settings$).then(
             (settings: AccountSettingsSettings) => {
               let matches: any[] = [];
-              settings.equivalentDomains?.forEach((eqDomain: any) => {
+              settings?.equivalentDomains?.forEach((eqDomain: any) => {
                 if (eqDomain.length && eqDomain.indexOf(domain) >= 0) {
                   matches = matches.concat(eqDomain);
                 }
diff --git a/libs/common/src/services/settings.service.ts b/libs/common/src/services/settings.service.ts
index 923bd8970dd..4a6986e37f1 100644
--- a/libs/common/src/services/settings.service.ts
+++ b/libs/common/src/services/settings.service.ts
@@ -6,7 +6,7 @@ import { Utils } from "../misc/utils";
 import { AccountSettingsSettings } from "../models/domain/account";
 
 export class SettingsService implements SettingsServiceAbstraction {
-  private _settings: BehaviorSubject<AccountSettingsSettings> = new BehaviorSubject({});
+  protected _settings: BehaviorSubject<AccountSettingsSettings> = new BehaviorSubject({});
 
   settings$ = this._settings.asObservable();