Why bothering me with "The quick bookmark icon is disabled"?

[CodingMarkus]

When I disable the quick bookmark feature, as all I need this addon for is choosing a default folder for Firefox bookmarks, why do I get this
when I click that in the address bar

?

Why don't you just remove the entry from the menu?

See https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Page_actions