TAC sent me IPS signature FOS 5.2.10 (flen-520-3.0406.pkg) few days back, i thought I was able to blocked psiphon completely but after a few minutes of waiting, psiphon successfully connected. whew!i started to scratched my head again ;)
Psiphon was presented since February 8, 2018 and is a great application part of Anonymous Proxy subcategory. It gained over 23,284 installations all time and more than 11 last week. It is accessible for Windows and the interface is in English.