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Password managers use browsers plugins, and as such can modify pages before they render as much as they like.

• AgentME 9y ago
  I usually use Chrome and Firefox's built-in password managers.
• dx034 9y ago
  Only if you use the plugin and the password manager identifies fields correctly.
• gpvos 9y ago
  Mine (PasswordSafe) doesn't, and it's probably not the only one.