Accessibility in Firefox Extensions: ARIA, Focus Management, and Screen Readers Browser extensions should work for everyone. Most accessibility mistakes are easy to fix once you know what to look for. The Basics: Semantic HTML First The most important accessibility tool is HTML semantics. Use the right element for the job: <!-- BAD: div soup with ARIA bolted on --> <div role= "button" tabindex= "0" onclick= "search()" > Search </div> <!-- GOOD: native button handles keyboard, focus, and ARIA automatically --> <button type= "submit" > Search </button> <!-- BAD: fake heading --> <div class= "title" > Weather & Clock Dashboard </div> <!-- GOOD: real heading --> <h1> Weather & Clock Dashboard </h1> Enter fullscreen mode Exit fullscreen mode Native elements are always better than ARIA-enhanced divs. Use ARIA only when native elements don't cover your use case.…