I use 1Password heavily and as am fond of its ability to create autofill bookmarks as I am annoyed by Safari's insistence on asking if it's ok to open them.
In my case, the answer is never "Cancel," and the solution to "stop asking me that!" is so simple I'm embarrassed to admit I snarled "Allow! curséd Safari!" for a year before putting a stop to it.
All it takes is one little AppleScript in Safari's scope.
Allow 1Password.kmmacros (2.8 KB)