As Panopticlick shows, if you can run JS, you can already probably uniquely fingerprint a user.
The GL_RENDERER string will add a few more bits of identifying information, but allows driver specific workarounds for buggy implementations. It's user agent sniffing all over again.
The GL_RENDERER string will add a few more bits of identifying information, but allows driver specific workarounds for buggy implementations. It's user agent sniffing all over again.