Thanks for suggestion, I have already test this setting option.
It works only partial. Indeed the autofill window doesn't show.
The problem is when i modify/alter value of text field it always prompt for option to store this value (as a password to LastPass)
This makes me in furious, this nagging ballot with proposition to store text to LastPass vault
Any other ideas? i don't want to turn off autofill service as it's really convenient.