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I know nothing about Android or the mobile app; I’d suggest starting a new forum thread for that.
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In your Brave browser click this link to install the browser extension.
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Yes, you should absolutely enable some form of 2FA for your Bitwarden account. If you have a premium subscription, and if you can afford a Yubikey and feel comfortable using one, then the strongest form of 2FA is the WebAuthn/FIDO2 option (which can be set up using a Yubikey).
If you haven’t already done so, please prepare an Emergency Sheet, and store it securely. At a minimum, your Emergency Sheet should contain the following information:
- The server on which your account is hosted (bitwarden.com or bitwarden.eu).
- The email address that you use as your Bitwarden login username.
- Your master password.
- Your Bitwarden 2FA Recovery Code.
- The password for your password-protected backups*
*Backups: On a regular basis (depending on how frequently you make updates to your vault contents), you should be creating backups of your vault. The easiest way of doing this securely is to log in to your Web Vault and creating a password-protected export. Detailed instructions for how to do this are available here.