message: Disable spellchecking in the options
diff: List the features to disable, by <a href="https://github.com/sindresorhus/refined-github/tree/master/source/features" target="_blank">filename</a>:
  </p>
  <p>
  - <textarea name="disabledFeatures" rows="3" placeholder="For example: &#10;mark-unread hide-own-stars"></textarea>
  + <textarea name="disabledFeatures" rows="3" placeholder="For example: &#10;mark-unread hide-own-stars" spellcheck="false"></textarea>
  <span class="small"><strong>Notice:</strong> Mostly untested; only JavaScript-based features can be disabled.</span>
  </p>
  <p>
  <h2>Custom CSS</h2>
  <p>Write your custom CSS to override Refined GitHub's default styles.</p>
  <p>
  - <textarea name="customCSS" rows="5"></textarea>
  + <textarea name="customCSS" rows="5" spellcheck="false"></textarea>
  </p>
  <h2>More features</h2>
  