title: Firefox / Chrome / MS Edge extensions using chrome.* or browser.*
body: <p>So I couldn't find anything that talked about using chrome.* or browser.* specifically. In some of the WebExtension examples it uses browser.* (<code>browser.runtime.getManifest();</code>)
  <a href="https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/runtime/getManifest" rel="nofollow noreferrer">https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/runtime/getManifest</a>, and in others it uses chrome.* (<code>chrome.notifications.create</code>), <a href="https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/notifications" rel="nofollow noreferrer">https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/notifications</a>.</p>
  
  <p>I'm not entirely sure what's the difference. Is it contextual? Both chrome.* and browser.* are available in my content script and in the background script in Firefox. I looked at IEs docs as well and they use browser.* ( didn't see chrome.* in their docs)</p>
  
  <p>I'd like to know what the difference is between and do Chrome extensions only use chrome.* or does it have browser.* as well (does IE only have browser.*)? </p>