nathggns · April 4, 2019 15:57 · Apr 4, 2019
diff --git a/README.md b/README.md
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+Twitter has started testing a new desktop website based on their mobile website that should be a faster experience. 
+
+If you're not lucky enough to be included in this A/B test, you can "break" into it by setting the `rweb_optin` cookie to `on`. 
+
+You can do that by pasting the following URL into your browser's address bar while you're logged-in on [https://twitter.com](https://twitter.com/).
+
+```
+javascript:document.cookie%3D'rweb_optin%3Don%3B%20expires%3D01%2F12%2F2019%3B%20path%3D%2F%3B'%3Bwindow.location.reload()%3B
+```
+
+### Safari
+
+Safari might prevent you from pasting javascript into the URL bar. In which case, you need to enable that feature.
+
+Firstly, turn on developer mode in Safari's advanced preferences – "Show Develop menu in menu bar". Then, under the Develop menu, check "Allow JavaScript from Smart Search field". 
+
+### Security
+
+If you're concerned about pasting arbitrary javascript into your browser, that URL was produced by the following code
+
+```javascript
+`javascript:${encodeURIComponent("document.cookie='rweb_optin=on; expires=01/12/2019; path=/;';window.location.reload();")}`;
+```
+
+And it simply runs the following javascript
+
+```javascript
+document.cookie='rweb_optin=on; expires=01/12/2019; path=/;';
+window.location.reload();
+```
+