per niente facile renderlo attivo come una volta.

It doesn't work in simplest scenario. Like,

I type the url in the address box, say www.linkedin.com
Browser tries to establish connection and timouts.
I press add-on's button with "X" on it.
I see nice box with "Non-proxied page" on it and nice picture like My Computer -> about:newtab.
I see www.linkedin.com in the address box.
I stay puzzled about how the hell do I enable this add-on for this site.

I do not consider this scenario like anything near to "working". Do developers ever test their products these days?

ADDS. Adds everywere...

Couldn't enable on blocked site.

everything is working smoothly atm

Far worse than the version of older FF (before v57)

It doesn't work. Always I see "Non-proxied page". In Mozilla 56 - it works, So, now doesn't work.

The new version is terrible. I don't mind the premium but this is just plain downgrade.