No tool can route your traffic through another user’s session without that user’s explicit login credentials. Any website claiming to do this is a phishing site. If you enter your Facebook credentials into such a tool, you will lose your own account. The only real way to see a locked profile via a mutual friend is to ask that friend to show you their screen or send you screenshots—which is a social, not technical, solution.

Type: "Photos of [Name of Person]" or check the profiles of their known friends for public tags. 3. What Does NOT Work: Beware of Scams

: Phishing scams often require you to log into your Facebook account through their tool, giving hackers your password.

They require you to log in with your own Facebook credentials, which are then stolen (phishing).

When a user activates this feature through the Facebook App Settings, several automatic changes occur:

The profile picture (often restricted but sometimes visible in small form). The profile bio.

When a user enables the profile lock feature, Facebook automatically applies a strict set of privacy rules to their account. Understanding these restrictions helps clarify what is and is not visible to the public.