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If I log in to my Online Vault will LastPass launch and fill my sites for me?
The Online Vault at www.lastpass.com enables you to view your logins and passwords and you can launch sites by clicking on them to AutoLogin. However the online Vault cannot autofill data for your or autolog you into that saved site. You will need the browser plugin downloaded and enabled to be able to autofill your sites.
See the information here for downloading and installing the LastPass browser extension for the full LastPass experience.