diff --git a/front/src/Phaser/Menu/MenuScene.ts b/front/src/Phaser/Menu/MenuScene.ts
index 6ed26730..58e7f0a6 100644
--- a/front/src/Phaser/Menu/MenuScene.ts
+++ b/front/src/Phaser/Menu/MenuScene.ts
@@ -140,7 +140,7 @@ export class MenuScene extends Phaser.Scene {
             this.warningContainer?.destroy();
             this.warningContainer = null
             this.warningContainerTimeout = null
-        }, 2000);
+        }, 120000);
         
     }
 
diff --git a/front/src/WebRtc/CoWebsiteManager.ts b/front/src/WebRtc/CoWebsiteManager.ts
index d859a2a9..8297257f 100644
--- a/front/src/WebRtc/CoWebsiteManager.ts
+++ b/front/src/WebRtc/CoWebsiteManager.ts
@@ -73,7 +73,7 @@ class CoWebsiteManager {
 
     private initResizeListeners() {
         const movecallback = (event:MouseEvent) => {
-            this.verticalMode ? this.height -= event.movementY : this.width -= event.movementX;
+            this.verticalMode ? this.height -= event.movementY / this.getDevicePixelRatio() : this.width -= event.movementX / this.getDevicePixelRatio();
             this.fire();
         }
         
@@ -91,6 +91,12 @@ class CoWebsiteManager {
             this.resizing = false;
         });
     }
+    
+    private getDevicePixelRatio(): number {
+        //on chrome engines, movementX and movementY return global screens coordinates while other browser return pixels
+        //so on chrome-based browser we need to adjust using 'devicePixelRatio'
+        return window.navigator.userAgent.includes('Firefox') ? 1 : window.devicePixelRatio;
+    }
 
     private close(): void {
         this.cowebsiteDiv.classList.remove('loaded'); //edit the css class to trigger the transition