Why is there a separate 1Password app for Safari?

I don't understand the purpose of a separate 1Password app for Safari. 1PW works fine as an extension in other browsers. If I have the normal 1PW app for Mac, can't I use it in Safari the same way I use it in other browsers?

1Password Version: 1Password for Mac 8.10.0 (81000055)
Extension Version: Not Provided
OS Version: 12.6.3
Browser:_ Firefox
Referrer: forum-search:safari