Cookies management

Last Updated: 03/19/2019

What is a cookie ?

Cookies are small text files stored on your equipment (computer, tablet, mobile …) in order to optimize your navigation on a site. There are several categories of cookies:

  • Essential : Essential: These cookies are essential for the proper functioning of the sites and their functionalities. These are, for example, authentication cookies
  • Comfort: These cookies improve the comfort and usability of websites and provide various services. For example, these comfort cookies can be used to store the results of your searches or your language preferences, etc.
  • Performance: These cookies collect information about how you use the websites. Performance cookies help, for example, to identify the most popular sections of a site and thus offer the content that best suits your needs
  • Advertising: These cookies are used to distribute advertising and promotional information that is adapted to you, for example, based on the web pages you have visited

Why do we use cookies?

We use cookies in order to optimize your visit to our site.

What are the different types of cookies?

There are different types of cookies.

  • Session cookies: These cookies are automatically deleted when you close your browser
  • Persistent cookies: These cookies remain on your terminal equipment until their expiry date which can vary from a few minutes to several days, even a few years
  • Third party cookies: These cookies are stored on behalf of third parties. You have the option to manage and delete these cookies. However, we draw your attention to the fact that these changes may prevent you from using certain features of our site correctly. For more information, you can consult the website of the CNIL.

How to manage cookies on our site?

To enable you to best manage cookies on our site, you can:

  • Enable or disable cookies directly from our site from the banner at the bottom of the page: “My preferences” (deactivatable cookies only) or “OK, accept everything
  • Or use the setting specific to each browser (see next paragraph)

If you choose to disable third-party cookies, our site will not use them after their deactivation (we can not delete them). You will still be able to browse the website, but you may not be able to enjoy certain features of our website.

Change cookie settings (most frequently used browsers)?

For the management of cookies, each browser offers a configuration process that will allow you to know how to manifest your will in terms of cookies:

1) For Internet Explorer™ :

Open the “Tools” menu, then select “Internet Options“, click on the “Privacy” tab, then the “Advanced” tab, choose the desired level, or follow this link:

2) For Firefox™ :

Open the “Tools” menu, then select “Options“, click on the “Privacy” tab, then choose the desired options, or follow this link:

3) For Chrome™ :

Open the configuration menu [Plus Icon (3 points) – at the top right of the page], then select “Settings“, click “Advanced Settings“, then in the “Content Settings” section, click “Cookies” », Choose the desired options, or follow the link below:

4) For Safari™ :

Choose “Safari > Preferences” and click on “Security“. In the “Accept cookies” section, choose the desired options, or follow this link:

5) For Opera™ :

Open the “Tools” or “Settings” menu, then select “Delete Private Data“, click on the “Detailed Options” tab, then choose the desired options, or follow this link:

6) On a mobile:

To specify whether Safari ™ accepts cookies or not:
1) In the main view, choose Settings > Safari™
2) Touch Accept cookies and choose “Never“, “Sites visited” or “Always

To erase all cookies in Safari™
1) In the main view, choose Settings > Safari™
2) Touch Clear cookies

To delete cookies on Androïd™
Menu> Settings> Clear all cookies

Recommendations of the CNIL:

The CNIL website suggests some tips to limit the traceability of your web browsing:

1) Block third-party cookies:

Third-party cookies are not usually necessary to take advantage of the resources available on the Internet. If you want to limit your tracks, it is recommended to refuse them by default

2) Prevent installation of the most common trackers:

Many extensions allow to block different tracers. For example, for Chrome browser, DoNotTrackMe, Disconnect, Ghostery …

3) Block social sharing buttons:

Social network buttons inform Facebook, Twitter … of your visit. You can prevent it with an extension, such as «Share me not».

4) Limit tracing in Adobe Flash:

It is recommended that you change these settings by connecting to the Online Settings Manager, but if the Flash site has a disabling feature to prevent storage on computers, it will not work at 100%. LSO (Flash) cookies resist the manipulation of erasing “traditional” cookies via the web browser. Rather than manually erasing LSO cookies, it is possible to download an extension to your browser that will allow you to delete them each time the browser is closed. For example, «Betterprivacy» pour Firefox

Google Analytics Deactivation Module:

If you do not want Google Analytics to analyze your activity on the sites you visit, you can install the browser add-on for opt-out of Google Analytics. The latter prevents the Google Analytics JavaScript code (ga.js, analytics.js and dc.js) inserted on the websites from sharing information about your visit with Google Analytics.

Module download link

Social networks :

We include on our site links allowing you to go directly on social networks such as: Facebook, Twitter, Instagram, Flickr …

We invite you to consult the privacy policies of these social networks to learn the purpose of using the navigation information they can collect.


Cookies and other storage technologies, see page

Twitter, Inc.

Use of cookies and similar technologies, see page

Instagram, Inc.

About cookies, see the page

Flickr, Inc.

Flickr policy on cookies, see page

Table of the main cookies that you may encounter (examples):

Name of the cookie Duration Description
_ga 2 years Used to distinguish users
_gid 24 Hours Used to distinguish users
_gat 1 minute Used to reduce the demand rate. If Google Analytics is deployed via Google Tag Manager, this cookie will be named_dc_gtm_
__cfduid 6 months The “__cfduid” cookie is defined by the CloudFlare service to identify trusted web traffic. It does not match any user ID in the web application and the cookie does not store any personally identifiable information.
__utma 2 years, from a refresh of a page. Used to distinguish users and sessions The cookie is created when the javascript library is executed. The cookie is updated whenever data is sent to Google Analytics
__utmt 10 minutes Used to reduce the demand rate
__utmb 30 minutes, from a refresh of a page Used to determine new sessions / visits. The cookie is created when the javascript library is run and no __utmb cookie exists. The cookie is updated whenever data is sent to Google Analytics.
__utmc End of browser session Not used in ga.js. Defined for interoperability with urchin.js. Historically, this cookie worked in conjunction with the __utmb cookie to determine if the user was in a new session / visit.
__utmz 6 months, from a refresh of a page Stores the traffic source or campaign that explains how the user reached your site. The cookie is created when the javascript library is run and updated each time data is sent to Google Analytics.
__utmv 2 years, from a refresh of a page Stores custom variable data at the visitor level. This cookie is created when a developer uses the _setCustomVar method with a visitor-level custom variable. This cookie has also been used for the obsolete _setVar method. The cookie is updated whenever data is sent to Google Analytics