Here's how you can reproduce it:
1) Install Tampermonkey
2) Install Temporary Containers and set Isolation->Global->Navigation as Different from tab domain
3) Visit the following link: http://moc.sirtetris.com/enlargeJapanese.user.js
Adding the moc.sirtetris.com to exclusions or disabling HTTPZ altogether does solve the problem.
Here's how you can reproduce it: 1) Install Tampermonkey 2) Install Temporary Containers and set Isolation->Global->Navigation as Different from tab domain 3) Visit the following link: http://moc.sirtetris.com/enlargeJapanese.user.js
Adding the moc.sirtetris.com to exclusions or disabling HTTPZ altogether does solve the problem.