diff --git a/apps/chrome-devtools/src/app-devtools/localization-panel/localization-panel-pres.component.ts b/apps/chrome-devtools/src/app-devtools/localization-panel/localization-panel-pres.component.ts
index 1179d7a6d1..76fb23d622 100644
--- a/apps/chrome-devtools/src/app-devtools/localization-panel/localization-panel-pres.component.ts
+++ b/apps/chrome-devtools/src/app-devtools/localization-panel/localization-panel-pres.component.ts
@@ -84,17 +84,6 @@ export class LocalizationPanelPresComponent implements OnDestroy {
   public accordion = viewChild<NgbAccordionDirective>('acc');
 
   constructor() {
-    this.connectionService.sendMessage(
-      'requestMessages',
-      {
-        only: [
-          'localizations',
-          'languages',
-          'switchLanguage',
-          'isTranslationDeactivationEnabled'
-        ]
-      }
-    );
     this.hasSeveralLanguages = computed(() => this.languages().length >= 2);
     this.localizations = computed(() => this.localizationService.localizationsMetadata().filter((localization) => !localization.dictionary && !localization.ref));
     this.hasLocalizations = computed(() => !!this.localizations().length);
diff --git a/apps/chrome-devtools/src/components/app-connection/app-connection.component.ts b/apps/chrome-devtools/src/components/app-connection/app-connection.component.ts
index fb09ede3f7..e9a14c5c34 100644
--- a/apps/chrome-devtools/src/components/app-connection/app-connection.component.ts
+++ b/apps/chrome-devtools/src/components/app-connection/app-connection.component.ts
@@ -1,11 +1,8 @@
 import { AsyncPipe } from '@angular/common';
-import { ChangeDetectionStrategy, Component, OnDestroy } from '@angular/core';
-import { Observable, of, Subscription } from 'rxjs';
-import { catchError, map, startWith, take, timeout } from 'rxjs/operators';
-import { ChromeExtensionConnectionService, isRuleEngineEventsMessage } from '../../services/connection.service';
-import { RulesetHistoryService } from '../../services/ruleset-history.service';
+import {ChangeDetectionStrategy, Component, inject, OnDestroy} from '@angular/core';
+import { Observable, Subscription } from 'rxjs';
+import { AppState, ChromeExtensionConnectionService } from '../../services/connection.service';
 
-type AppState = 'loading' | 'timeout' | 'connected';
 
 @Component({
   selector: 'app-connection',
@@ -17,32 +14,14 @@ type AppState = 'loading' | 'timeout' | 'connected';
   ]
 })
 export class AppConnectionComponent implements OnDestroy {
-  /** Stream of application's state */
-  public appState$: Observable<AppState>;
-
   private readonly subscription = new Subscription();
+  private readonly connectionService = inject(ChromeExtensionConnectionService);
 
-  constructor(
-    connectionService: ChromeExtensionConnectionService,
-    rulesetHistoryService: RulesetHistoryService
-  ) {
-    this.subscription.add(
-      connectionService.message$.subscribe((message) => {
-        if (isRuleEngineEventsMessage(message)) {
-          rulesetHistoryService.update(message);
-        }
-      })
-    );
-
-    this.appState$ = connectionService.message$.pipe(
-      map(() => 'connected' as AppState),
-      take(1),
-      startWith('loading' as AppState),
-      timeout(3000),
-      catchError(() => of('timeout' as AppState))
-    );
+  /** Stream of application's state */
+  public appState$: Observable<AppState> = this.connectionService.appState$;
 
-    connectionService.activate();
+  constructor() {
+    this.connectionService.activate();
   }
 
   /** @inheritDoc */
diff --git a/apps/chrome-devtools/src/services/connection.service.ts b/apps/chrome-devtools/src/services/connection.service.ts
index c2de597a59..9f3653dbf2 100644
--- a/apps/chrome-devtools/src/services/connection.service.ts
+++ b/apps/chrome-devtools/src/services/connection.service.ts
@@ -2,8 +2,18 @@ import { ApplicationRef, Injectable, OnDestroy } from '@angular/core';
 import type { Dictionary } from '@ngrx/entity';
 import type { ConfigurationModel } from '@o3r/configuration';
 import { otterMessageType } from '@o3r/core';
-import { type Observable, ReplaySubject, Subscription } from 'rxjs';
-import { debounceTime, distinctUntilChanged, filter, map, shareReplay } from 'rxjs/operators';
+import {type Observable, of, ReplaySubject, Subscription} from 'rxjs';
+import {
+  catchError,
+  debounceTime,
+  distinctUntilChanged,
+  filter,
+  map,
+  shareReplay,
+  startWith,
+  take,
+  timeout
+} from 'rxjs/operators';
 import type { AvailableMessageContents } from './message.interface';
 
 import type { ApplicationInformationContentMessage } from '@o3r/application';
@@ -59,6 +69,8 @@ export const filterAndMapMessage = <T extends AvailableMessageContents, R>(
     shareReplay({ refCount: true, bufferSize: 1 })
   );
 
+export type AppState = 'loading' | 'timeout' | 'connected';
+
 /**
  * Service to communicate with the current tab
  */
@@ -71,6 +83,15 @@ export class ChromeExtensionConnectionService implements OnDestroy {
 
   /** Stream of messages received from the service worker */
   public message$ = this.messageSubject.asObservable();
+  /** Stream the state of the extension connection to the Otter application*/
+  public appState$ = this.message$.pipe(
+    map(() => 'connected' as AppState),
+    take(1),
+    startWith('loading' as AppState),
+    timeout(3000),
+    catchError(() => of('timeout' as AppState))
+  );
+
 
   private readonly configurations = new ReplaySubject<Dictionary<ConfigurationModel>>(1);
   public configurations$ = this.configurations.asObservable();
diff --git a/apps/chrome-devtools/src/services/localization.service.ts b/apps/chrome-devtools/src/services/localization.service.ts
index a01808770b..66295b0500 100644
--- a/apps/chrome-devtools/src/services/localization.service.ts
+++ b/apps/chrome-devtools/src/services/localization.service.ts
@@ -55,6 +55,23 @@ export class LocalizationService {
   );
 
   constructor() {
+    const activated = toSignal(this.connectionService.appState$);
+    effect(() => {
+      if (activated() === 'connected') {
+        this.connectionService.sendMessage(
+          'requestMessages',
+          {
+            only: [
+              'localizations',
+              'languages',
+              'switchLanguage',
+              'isTranslationDeactivationEnabled'
+            ]
+          }
+        );
+      }
+    });
+
     effect(() => {
       const currentLanguage = this.currentLanguage();
       if (currentLanguage) {
diff --git a/apps/chrome-devtools/src/services/ruleset-history.service.ts b/apps/chrome-devtools/src/services/ruleset-history.service.ts
index d4a6cc596e..e1cac9cdb5 100644
--- a/apps/chrome-devtools/src/services/ruleset-history.service.ts
+++ b/apps/chrome-devtools/src/services/ruleset-history.service.ts
@@ -1,14 +1,17 @@
-import { Injectable } from '@angular/core';
+import {effect, inject, Injectable} from '@angular/core';
 import type { RulesEngineDebugEventsContentMessage, RulesetExecutionDebug } from '@o3r/rules-engine';
 import { rulesetReportToHistory } from '@o3r/rules-engine';
-import { map, Observable, ReplaySubject } from 'rxjs';
+import {filter, map, Observable, ReplaySubject} from 'rxjs';
 import {shareReplay} from 'rxjs/operators';
+import {ChromeExtensionConnectionService, isRuleEngineEventsMessage} from './connection.service';
+import {toSignal} from '@angular/core/rxjs-interop';
 
 @Injectable({
   providedIn: 'root'
 })
 export class RulesetHistoryService {
   private readonly ruleEngineDebugEventsSubject = new ReplaySubject<RulesEngineDebugEventsContentMessage>(1);
+  private readonly connectionService = inject(ChromeExtensionConnectionService);
 
   /** Ruleset history stream */
   public readonly ruleEngineDebugEvents$ = this.ruleEngineDebugEventsSubject.asObservable();
@@ -21,6 +24,16 @@ export class RulesetHistoryService {
     shareReplay({bufferSize: 1, refCount: true})
   );
 
+  constructor() {
+    const extensionMessage = toSignal(this.connectionService.message$.pipe(filter(isRuleEngineEventsMessage)));
+    effect(() => {
+      const message = extensionMessage();
+      if (message) {
+        this.update(message);
+      }
+    });
+  }
+
   /**
    * Update the ruleset history
    * @param message Message from the background service
@@ -28,4 +41,5 @@ export class RulesetHistoryService {
   public update(message: RulesEngineDebugEventsContentMessage) {
     this.ruleEngineDebugEventsSubject.next(message);
   }
+
 }
diff --git a/apps/chrome-devtools/src/services/state.service.ts b/apps/chrome-devtools/src/services/state.service.ts
index 5a0de49c9d..f7964bb0c4 100644
--- a/apps/chrome-devtools/src/services/state.service.ts
+++ b/apps/chrome-devtools/src/services/state.service.ts
@@ -1,4 +1,4 @@
-import { computed, effect, inject, Injectable, signal, type Signal, untracked } from '@angular/core';
+import { computed, effect, inject, Injectable, signal, type Signal } from '@angular/core';
 import { toSignal } from '@angular/core/rxjs-interop';
 import { ChromeExtensionConnectionService, filterAndMapMessage, isApplicationInformationMessage } from './connection.service';
 import { ACTIVE_STATE_NAME_KEY, type State, type StateOverride, STATES_KEY } from '../extension/interface';
@@ -75,7 +75,7 @@ export class StateService {
 
     effect(() => {
       const state = this.activeState();
-      const languages = untracked(this.languages);
+      const languages = this.languages();
       this.updateLocalState(state || {}, true);
       // TODO reset configuration (is it possible? based on default value from metadata if present?)
       // Reset all styling variables before applying override of the new state