Maxthon Spyware-Like Behavior - Looking For Additional Confirmations
According to Polish security researchers at Exatel, Maxthon Cloud currently engages in multiple spyware activities. An English translation of the report can be found here: https://exatel.pl/advisory/maxthonreporten.pdf
User ksdev on Hacker News summarizes it:
TL;DR: It doesn't matter if you agree to join "User Experience Improvement Program" in Maxthon or not - the browser regularly sends this data to Beijing servers: