How To Turn Off Firefox Sync For Specific Devices

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When Firefox syncing is enabled, bookmarks, open tabs, logins, history and add-ons will be available on various other devices which are added to the sync list. This is handy for ensuring a consistent cross-platform browsing experience. As long as Firefox is installed on different devices with the same account login, this data can be synced. However, it may happen that a device is now no longer used...