change text

меняет выделенный текст на странице

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name         change text
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  меняет выделенный текст на странице
// @author       awaw (Andrey) https://zelenka.guru/andrey/
// @match        *://*/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    function changeSelectedText() {
        var selectedText = window.getSelection().toString();
        if (selectedText !== "") {
            var newText = prompt('Введи текст');
            if (newText !== null) {
                var range = window.getSelection().getRangeAt(0);
                range.deleteContents();
                range.insertNode(document.createTextNode(newText));
            }
        } else {
            alert('Выдели текст который хочешь изменить');
        }
    }

// кнопка. можно менять область и как далеко оно находится, надпись (можно убрать, будет маленькая кнопочка)

    function addChangeTextButton() {
        var button = document.createElement('button');
        button.innerText = 'изменить'; // тут меняется или убирается текст
        button.style.position = 'fixed';
        button.style.bottom = '10px';
        button.style.right = '10px';
        button.addEventListener('click', changeSelectedText);
        document.body.appendChild(button);
    }

    window.addEventListener('load', function() {
        addChangeTextButton();
    });
})();