pixivBookmarkRedirect.user.js

// ==UserScript==
// @name         Pixiv Bookmark redirect
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Makes pixiv redirect to image page after editing bookmark
// @author       NO_ob
// @match        https://www.pixiv.net/bookmark_add.php*
// @grant        none
// @run-at      document-idle
// ==/UserScript==

(function() {
    let editButton = document.createElement("button");
    editButton.setAttribute("class","_button-large");
    editButton.setAttribute("id","scriptEditButton");
    editButton.setAttribute("type","button");
    editButton.innerHTML = "Edit Bookmark";
    document.querySelector("div.submit-container > input").remove();
    document.querySelector("div.submit-container").appendChild(editButton);
    document.getElementById("scriptEditButton").addEventListener("click", submitForm);
})();
function submitForm(){
    let xhr = new XMLHttpRequest();
    xhr.open("POST", document.querySelector("section._unit > form").action);
    var formData = new FormData(document.querySelector("section._unit > form"));
    xhr.onload = function(event){
        window.location = document.querySelector("div.thumbnail-container > a.work").href;
    };
    // or onerror, onabort
    xhr.send(formData);
}