Add the script itself!

tootify.js

@@ -0,0 +1,41 @@
+// ==UserScript==
+// @name        Tootify
+// @namespace   https://badrihippo.github.io
+// @version     1
+// @description restore the "toot!" button to mastodon
+// @author      Badri Sunderarajan
+// @match       *://(fosstodon.org|scholar.social)/*
+// ==/UserScript==
+
+// By the way, you can add your own Mastodon domain to the "@match" field to make it work there too :)
+
+// This is the actual function that changes the buttons
+function tootify() {
+  
+  // "Publish" button on smaller devices (opens the compose box)
+  document.querySelectorAll('a.button[href="/publish"]').forEach(l => l.innerText = 'Toot')
+  
+  // "Publish!" button that actually sends out the post
+  document.querySelectorAll('.compose-form__publish-button-wrapper button').forEach(b => b.innerText = 'Toot!')
+}
+
+// This is the function that activates everything on page load
+(function() {
+  window.onload = function() {
+    
+    // Run the tootify once
+    tootify()
+    
+    // Run it again every time the location changes
+    let lastUrl = location.href
+
+    new MutationObserver(() => {
+        const url = location.href;
+        if (url !== lastUrl) {
+          lastUrl = url;
+          tootify();
+        }
+    }).observe(document, {subtree: true, childList: true})
+
+  }
+})()