New answers tagged security
I'm speculating here, but a couple of possibilities come to mind: you already had an active session with your Google account and signed in from the same IP address; it seems logical to assume it was you Did you copy your Firefox configuration to Opera? Did that include cookies? User agent? Google may have believed that you were using the same browser, ...
AFAIK there isn't a way to export/download stored passwords yet. References Manage saved passwords from the web - Accounts Help Sync passwords across your devices - Accounts Help Manage saved passwords - Chrome Help
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