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how different devices can decrypt same data ?

yakoub.abaya
yakoub.abaya
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it is said here that synced data is encrypted to save privacy and protect against identity theft . https://support.mozilla.org/en-US/kb/firefox-lockwise-and-privacy

but if the synced data is encrypted by device A and sent to mozilla server for saving, how does device B able to decrypted the data received from mozilla after signing in ? this can be possible only if the encryption happens at mozilla server side and not the device itself .

doesn't this means mozilla server as well able to decrypt the data and read it ? so you can read all my passwords i synced through you ?

it is said here that synced data is encrypted to save privacy and protect against identity theft . https://support.mozilla.org/en-US/kb/firefox-lockwise-and-privacy but if the synced data is encrypted by device A and sent to mozilla server for saving, how does device B able to decrypted the data received from mozilla after signing in ? this can be possible only if the encryption happens at mozilla server side and not the device itself . doesn't this means mozilla server as well able to decrypt the data and read it ? so you can read all my passwords i synced through you ?

Chosen solution

Your installation of Firefox or the Lockwise app uses your Firefox Account password to encrypt and decrypt the data. Mozilla has a hash of the password used to verify your login, but it does not have the password itself, so Mozilla cannot decrypt the data.

See: How Firefox Sync keeps your data safe even if TLS fails

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jscher2000 - Support Volunteer
jscher2000 - Support Volunteer
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Chosen Solution

Your installation of Firefox or the Lockwise app uses your Firefox Account password to encrypt and decrypt the data. Mozilla has a hash of the password used to verify your login, but it does not have the password itself, so Mozilla cannot decrypt the data.

See: How Firefox Sync keeps your data safe even if TLS fails