There are several things we can sync on Firefox account. I tried to search the limits on storage and TTL for the stored data, but found very few information and threads. I didn't found any official documentation stating related info. These limits are not stated fully and clearly anywhere. So, I asked here again. What are the storage limits & TTLs for these syncable items : * Bookmarks * History * Add-ons * Settings * Open Tabs * Login Credentials * Credit Card info Also, I found on some thread stating that Firefox sync stores data for 60 days, and Firefox can receive it. But, Firefox cannot send data older than 30 days. Please clarify this behaviour as well. Thanks in advanced..!