Préférences de personnalisation de la synchronisation

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Attention ! Ces instructions s’adressent aux personnes qui ont une utilisation avancée de Firefox. Modifier les préférences dans l’éditeur de configuration (la page about:config) peut affecter sérieusement la stabilité, la sécurité et les performances de Firefox.
Ne poursuivez que si vous êtes à l’aise avec les paramètres avancés et en comprenez les effets potentiels.

Firefox Sync vous offre la possibilité de synchroniser vos préférences entre tous vos Firefox sur ordinateur. Veuillez bien prendre note que la synchronisation des préférences n'est pris en charge que dans Firefox pour ordinateur.

We’ve chosen the list of preferences that can be synced so that the average user can sync preferences directly from the Firefox Desktop UI. However, advanced users, who want more control over which about:config preferences are synced, will benefit the most from this article.

Firefox whitelists the preferences that it will sync. Every preference that is synced appears in this whitelist. The whitelist itself is also stored in preferences, which includes every preference starting with services.sync.prefs.sync (also known as a “control preference”). These preferences will only be synced if their control preferences have been set to true via about:config. For example, the browser.some_preference preference will be synced only if the boolean services.sync.prefs.sync.browser.some_preference control preference has been set to true.

Firefox automatically creates a default whitelist, which is how it determines the default list of preferences to sync. If you don’t want to sync a default preference, you can change its control preference to false. For example, if you set the services.sync.prefs.sync.browser.some_preference preference to false, then it won’t be synced.

For safety reasons, only preferences that already have a local control preference will be applied locally. For example, if you want to sync a new preference that isn’t in the default list, you will need to ensure the new control preference has been created on every device. Firefox Sync won’t automatically copy custom control preferences to new devices.

This can be an issue for users who have many custom preferences synced. When adding a new device, they will need to ensure all the custom control preferences are set up on the new device before those preferences are synced. To assist new users, there’s another preference, services.sync.prefs.dangerously_allow_arbitrary, which controls this behavior. If you set this preference to true, then all preferences will be synced to the new device and not just those with an existing control preference. Therefore, users with many custom preferences can set the services.sync.prefs.dangerously_allow_arbitrary preference to true, perform the sync and set this preference back to false. This will cause all remote preferences to be applied.

This behavior changed in Firefox version 68. Prior to version 68, Firefox always acted as if services.sync.prefs.dangerously_allow_arbitrary was set to true.