Cookies and browser measurements are different

A cookie is stored state that a site can use on later visits. A fingerprint is assembled from observable properties or behavior. The W3C's fingerprinting guidance discusses this wider identification surface. Clearing cookies or opening a fresh profile changes stored state; it does not establish that two visits cannot be associated through other signals.

A proxy changes a route

A working proxy can change the address seen by a destination. It does not by itself change graphics output, processor information, screen behavior or the browser engine. A country flag next to an exit IP is a connection result, not a certificate that the browser looks like a particular person or device.

Consistency matters more than a convincing label

Selecting a device name or changing a user-agent string is not equivalent to running that device. A site may observe top-level pages, embedded frames and workers differently. Our diagnostic work therefore distinguishes values that the engine actually exposes from fields that merely describe a desired profile. We do not present a page-level JavaScript patch as a complete engine implementation.

What Mac Profiles currently claims

Mac Profiles separates profile data and provides controlled proxy startup on the specifically supported WebKit build. Language and time zone are established before the protected profile opens its first page. Complete replacement of hardware, Canvas, WebGL, audio and all other fingerprint surfaces is not a finished product capability. Network test results and fingerprint coverage remain separate questions.

Evaluate a specific requirement

Write down what your workflow needs: separate logins, a particular route, a language or a repeatable browser environment. Check each requirement independently, including after restart and connection failure. A single score from a testing website cannot establish compatibility with every service, guarantee anonymity or predict how an account will be treated.

The new internal build offers optional native fingerprinting protection, off by default. On the verified WebKit version, it reduces selected Canvas 2D, audio and screen signals. Its scope is bounded: raw WebGL readPixels remains unchanged, while results can vary across repeated reads, new tabs or restarts. It does not establish a stable profile seed or turn the Mac into a different physical device. Check the particular API and website behavior you need rather than treating one detector’s overall score as a guarantee.