Mark all as read

Is it possible to send a warning/confirmation before marking all as read? I always hit that button on accident (when I intended to create a new topic mostly), and all the unread forums are lost...

If you can use userscripts, this will help:

// ==UserScript==
// @name        Danbooru confirm mark all as read
// @include     /^https?://\w+.donmai.us/forum_topics(/.*)?/
// @version     0.1.0
// @author      Nameless Contributor
// ==/UserScript==

document.getElementById('subnav-mark-all-as-read-link')?.setAttribute('data-confirm', 'Are you sure you want to mark all topics as read?');

Some CSS for those that never want to mark all topics as read, such as myself.

#subnav-mark-all-as-read {
    display: none;
}