---
title: runtime.onStartup
slug: Mozilla/Add-ons/WebExtensions/API/runtime/onStartup
tags:
- API
- Add-ons
- Event
- Extensions
- Non-standard
- Reference
- WebExtensions
- onStartup
- runtime
translation_of: Mozilla/Add-ons/WebExtensions/API/runtime/onStartup
---
{{AddonSidebar()}}
Lancé quand un profil ayant cette extension installée démarre une session. Cet événement n'est pas déclenché lorsqu'une navigation privée / profil privé est démarré, même si cette extension fonctionne en mode de navigation privée 'split'.
## Syntaxe
```js
browser.runtime.onStartup.addListener(listener)
browser.runtime.onStartup.removeListener(listener)
browser.runtime.onStartup.hasListener(listener)
```
### Fonctions des événements
Les événements ont trois fonctions :
- `addListener(callback)`
- : Ajoute un écouteur à écouteur.
- `removeListener(listener)`
- : Arrête d'écouter cet événement. L'argument `listener` est l'écouteur à supprimer.
- `hasListener(listener)`
- : Vérifie si un `écouteur` est enregistré pour cet événement. Renvoie `true` s'il écoute, sinon `false`.
### Parameters
- `callback`
- : Une fonction qui sera appelée lorsque cet événement se produit.
## Exemples
Ouvre
// Copyright 2015 The Chromium Authors. All rights reserved. // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following disclaimer // in the documentation and/or other materials provided with the // distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived from // this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.