Authenticator от mymindstorm

Authenticator generates two-factor authentication (2FA) codes in your browser. Use it to add an extra layer of security to your online accounts.

Always keep a backup of your secrets in a safe location.
Encrypting your secrets is strongly recommended, especially if you are logged into a Firefox account.

Features:

• Add accounts by scanning QR codes
• Search your accounts by pressing "/"
• Translated into more than ten languages
• Encrypt your secrets with a password
• Backup your secrets to a file, Google Drive, or Dropbox
• Sync your secrets with your Firefox Account
• Open source

Permissions:

• "Access your data for all websites" - Needed to take screenshots for scanning QR codes
• "Input data to the clipboard" - Needed to copy codes when clicked

Supports:

• TOTP
• HOTP
• Steam Guard
• Blizzard Authenticator