title: Detect if Office Editing for Docs, Sheets & Slides is installed
body: <p>Is there a way to detect if 
  <a href="https://chrome.google.com/webstore/detail/office-editing-for-docs-s/gbkeegbaiigmenfmjfclcdgdpimamgkj?hl=en" rel="nofollow">'Office Editing for Docs, Sheets &amp; Slides'</a> 
  is installed in Chrome from javascript running in a webpage (not in extension) ?</p>
  
  <p>If it is installed, we want to open and edit the document in a new tab,
  while if it is not installed, we want to download the document in CURRENT tab.</p>