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How to be sure that some selected firefox sync data are erased?

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Hi!

I just set Firefox Sync and only one device is actually syncing.

Initially all items were checked like in the first figure. Then I unchecked everything but bookmarks like in the second figure.

Is that sufficient to say that now my Firefox Sync only contains bookmarks? In the next days I will connect other devices, but I do not want that these other devices get (and also share) preferences, tabs, passwords... (for example, sharing preferences results in having the same initial page, that I do not want)

I read that all Firefox Sync data are erased (from the server) if I change password. In order to achieve my aim, is it better to change my password too?

Thanks for the answers!

Hi! I just set Firefox Sync and only one device is actually syncing. Initially all items were checked like in the first figure. Then I unchecked everything but bookmarks like in the second figure. Is that sufficient to say that now my Firefox Sync only contains bookmarks? In the next days I will connect other devices, but I do not want that these other devices get (and also share) preferences, tabs, passwords... (for example, sharing preferences results in having the same initial page, that I do not want) I read that all Firefox Sync data are erased (from the server) if I change password. In order to achieve my aim, is it better to change my password too? Thanks for the answers!
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Modified by brancalessio

Chosen solution

No. Your data will get sync'd to newly connected devices that have those same data types selected. Deselecting a data type doesn't delete the associated data from the server.

If you want to clear all your data from the Sync server just change the Firefox Account password.

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Chosen Solution

No. Your data will get sync'd to newly connected devices that have those same data types selected. Deselecting a data type doesn't delete the associated data from the server.

If you want to clear all your data from the Sync server just change the Firefox Account password.