Forbo

If the link was unique to the email, then it could be a signal to the phisher that is a valid address for further targeting.

It rounds the browser window to the nearest 100x100 window size. Using the default will likely be the biggest dataset to hide yourself in, but maximizing the window will still have some amount of obfuscation.

Letterboxing has significantly reduced threat presented by window sizing. https://support.torproject.org/glossary/letterboxing/

Pseudonymous, not anonymous. It’s a little difference, but one that can determine whether you land behind bars/dead/doxxed.