title: Chrome extension and supporting older versions of chrome
body: <p>I have recently started working on a chrome extension which uses manifest v3. I see a lot of APIs being different from v2.</p>
  <p>So what happens when a user who is running an older version of chrome? As a developer, do I need to accommodate different chrome API calls based on the version that my extension is running on?</p>
  <p>As an example this code works in the current version <code>chrome.runtime.getURL('logo128.png')</code>.</p>
  <p>However, in the older versions <code>chrome.extension.getURL('logo128.png')</code> works.</p>
  <p>Any help in this direction is much appreciated! Thanks!</p>