This guide allows you to widen the size of your profile's edit summary, making it much easier to manage complex formatting or lots of links and text. The script in this guide is by djor.
Updated for 2023

First you'll need a browser plugin called Tampermonkey. It only takes a few seconds to get.

• Tampermonkey[chrome.google.com] for Chrome users.
  
• Tampermonkey[addons.mozilla.org] for Firefox users.

Once you've added the plugin to your browser,
Go and copy the script linked here[pastebin.com] then click the tampermonkey icon in your browsers extension bar, click on create a new script. Then paste the copied script and save it.

You can now go to your edit profile page in a browser and you'll see a button to enlarge your summary editor under your summary.

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